Concat objects in ramda (project nodejs)

Question

I am trying to apply ramda in my nodejs backend to do a concatenation of objects but I have not been able to establish the relationship of the objects when they are equal.

Here I show you the first arrangement:

{
  "ETHBTC": "0.03907000",
  "LTCBTC": "0.00481700",
  "BNBBTC": "0.00901600",
  "NEOBTC": "0.00200600",
  "QTUMETH": "0.00902000",
  "EOSETH": "0.00310500",
  "SNTETH": "0.00008902",
  "BNTETH": "0.00308500",
  "BCCBTC": "0.07908100",
  "GASBTC": "0.00032410",
  "BNBETH": "0.23078000",
  "BTCUSDT": "55974.56000000",
  "ETHUSDT": "2186.71000000",
  "HSRBTC": "0.00041400",
  "OAXETH": "0.00017780",
  "DNTETH": "0.00002801",
  "MCOETH": "0.00577200"
}

Here I show you the second arrangement:

[
  {
    "asset": "BTC",
    "free": "0.01054959",
    "locked": "0.00000000"
  },
  {
    "asset": "LTC",
    "free": "0.00000000",
    "locked": "0.00000000"
  },
  {
    "asset": "ETH",
    "free": "0.00000000",
    "locked": "0.00000000"
  }
]

Here I show you the third arrangement:

[
  {
    "symbol": "ETHBTC",
    "status": "TRADING",
    "baseAsset": "ETH",
    "baseAssetPrecision": 8,
    "quoteAsset": "BTC",
    "quotePrecision": 8,
    "quoteAssetPrecision": 8,
    "baseCommissionPrecision": 8,
    "quoteCommissionPrecision": 8,
    "orderTypes": [
      "LIMIT",
      "LIMIT_MAKER",
      "MARKET",
      "STOP_LOSS_LIMIT",
      "TAKE_PROFIT_LIMIT"
    ],
    "icebergAllowed": true,
    "ocoAllowed": true,
    "quoteOrderQtyMarketAllowed": true,
    "isSpotTradingAllowed": true,
    "isMarginTradingAllowed": true,
    "filters": [
      {
        "filterType": "PRICE_FILTER",
        "minPrice": "0.00000100",
        "maxPrice": "100000.00000000",
        "tickSize": "0.00000100"
      },
      {
        "filterType": "PERCENT_PRICE",
        "multiplierUp": "5",
        "multiplierDown": "0.2",
        "avgPriceMins": 5
      },
      {
        "filterType": "LOT_SIZE",
        "minQty": "0.00100000",
        "maxQty": "100000.00000000",
        "stepSize": "0.00100000"
      },
      {
        "filterType": "MIN_NOTIONAL",
        "minNotional": "0.00010000",
        "applyToMarket": true,
        "avgPriceMins": 5
      },
      {
        "filterType": "ICEBERG_PARTS",
        "limit": 10
      },
      {
        "filterType": "MARKET_LOT_SIZE",
        "minQty": "0.00000000",
        "maxQty": "1784.90123628",
        "stepSize": "0.00000000"
      },
      {
        "filterType": "MAX_NUM_ORDERS",
        "maxNumOrders": 200
      },
      {
        "filterType": "MAX_NUM_ALGO_ORDERS",
        "maxNumAlgoOrders": 5
      }
    ],
    "permissions": [
      "SPOT",
      "MARGIN"
    ]
  },
  {
    "symbol": "LTCBTC",
    "status": "TRADING",
    "baseAsset": "LTC",
    "baseAssetPrecision": 8,
    "quoteAsset": "BTC",
    "quotePrecision": 8,
    "quoteAssetPrecision": 8,
    "baseCommissionPrecision": 8,
    "quoteCommissionPrecision": 8,
    "orderTypes": [
      "LIMIT",
      "LIMIT_MAKER",
      "MARKET",
      "STOP_LOSS_LIMIT",
      "TAKE_PROFIT_LIMIT"
    ],
    "icebergAllowed": true,
    "ocoAllowed": true,
    "quoteOrderQtyMarketAllowed": true,
    "isSpotTradingAllowed": true,
    "isMarginTradingAllowed": true,
    "filters": [
      {
        "filterType": "PRICE_FILTER",
        "minPrice": "0.00000100",
        "maxPrice": "100000.00000000",
        "tickSize": "0.00000100"
      },
      {
        "filterType": "PERCENT_PRICE",
        "multiplierUp": "5",
        "multiplierDown": "0.2",
        "avgPriceMins": 5
      },
      {
        "filterType": "LOT_SIZE",
        "minQty": "0.01000000",
        "maxQty": "100000.00000000",
        "stepSize": "0.01000000"
      },
      {
        "filterType": "MIN_NOTIONAL",
        "minNotional": "0.00010000",
        "applyToMarket": true,
        "avgPriceMins": 5
      },
      {
        "filterType": "ICEBERG_PARTS",
        "limit": 10
      },
      {
        "filterType": "MARKET_LOT_SIZE",
        "minQty": "0.00000000",
        "maxQty": "10633.87362057",
        "stepSize": "0.00000000"
      },
      {
        "filterType": "MAX_NUM_ORDERS",
        "maxNumOrders": 200
      },
      {
        "filterType": "MAX_NUM_ALGO_ORDERS",
        "maxNumAlgoOrders": 5
      }
    ],
    "permissions": [
      "SPOT",
      "MARGIN"
    ]
  },
  {
    "symbol": "BNBBTC",
    "status": "TRADING",
    "baseAsset": "BNB",
    "baseAssetPrecision": 8,
    "quoteAsset": "BTC",
    "quotePrecision": 8,
    "quoteAssetPrecision": 8,
    "baseCommissionPrecision": 8,
    "quoteCommissionPrecision": 8,
    "orderTypes": [
      "LIMIT",
      "LIMIT_MAKER",
      "MARKET",
      "STOP_LOSS_LIMIT",
      "TAKE_PROFIT_LIMIT"
    ],
    "icebergAllowed": true,
    "ocoAllowed": true,
    "quoteOrderQtyMarketAllowed": true,
    "isSpotTradingAllowed": true,
    "isMarginTradingAllowed": true,
    "filters": [
      {
        "filterType": "PRICE_FILTER",
        "minPrice": "0.00000010",
        "maxPrice": "100000.00000000",
        "tickSize": "0.00000010"
      },
      {
        "filterType": "PERCENT_PRICE",
        "multiplierUp": "5",
        "multiplierDown": "0.2",
        "avgPriceMins": 5
      },
      {
        "filterType": "LOT_SIZE",
        "minQty": "0.01000000",
        "maxQty": "100000.00000000",
        "stepSize": "0.01000000"
      },
      {
        "filterType": "MIN_NOTIONAL",
        "minNotional": "0.00010000",
        "applyToMarket": true,
        "avgPriceMins": 5
      },
      {
        "filterType": "ICEBERG_PARTS",
        "limit": 10
      },
      {
        "filterType": "MARKET_LOT_SIZE",
        "minQty": "0.00000000",
        "maxQty": "3604.01847116",
        "stepSize": "0.00000000"
      },
      {
        "filterType": "MAX_NUM_ORDERS",
        "maxNumOrders": 200
      },
      {
        "filterType": "MAX_NUM_ALGO_ORDERS",
        "maxNumAlgoOrders": 5
      }
    ],
    "permissions": [
      "SPOT",
      "MARGIN"
    ]
  },
{
    "symbol": "BTCUSDT",
    "status": "TRADING",
    "baseAsset": "BTC",
    "baseAssetPrecision": 8,
    "quoteAsset": "USDT",
    "quotePrecision": 8,
    "quoteAssetPrecision": 8,
    "baseCommissionPrecision": 8,
    "quoteCommissionPrecision": 8,
    "orderTypes": [
      "LIMIT",
      "LIMIT_MAKER",
      "MARKET",
      "STOP_LOSS_LIMIT",
      "TAKE_PROFIT_LIMIT"
    ],
    "icebergAllowed": true,
    "ocoAllowed": true,
    "quoteOrderQtyMarketAllowed": true,
    "isSpotTradingAllowed": true,
    "isMarginTradingAllowed": true,
    "filters": [
      {
        "filterType": "PRICE_FILTER",
        "minPrice": "0.01000000",
        "maxPrice": "1000000.00000000",
        "tickSize": "0.01000000"
      },
      {
        "filterType": "PERCENT_PRICE",
        "multiplierUp": "5",
        "multiplierDown": "0.2",
        "avgPriceMins": 5
      },
      {
        "filterType": "LOT_SIZE",
        "minQty": "0.00000100",
        "maxQty": "9000.00000000",
        "stepSize": "0.00000100"
      },
      {
        "filterType": "MIN_NOTIONAL",
        "minNotional": "10.00000000",
        "applyToMarket": true,
        "avgPriceMins": 5
      },
      {
        "filterType": "ICEBERG_PARTS",
        "limit": 10
      },
      {
        "filterType": "MARKET_LOT_SIZE",
        "minQty": "0.00000000",
        "maxQty": "82.65659251",
        "stepSize": "0.00000000"
      },
      {
        "filterType": "MAX_NUM_ORDERS",
        "maxNumOrders": 200
      },
      {
        "filterType": "MAX_NUM_ALGO_ORDERS",
        "maxNumAlgoOrders": 5
      }
    ],
    "permissions": [
      "SPOT",
      "MARGIN"
    ]
  }
]

What I have to do is first take the asset value from the second array and look for its symbol in the third array.

Once I know what its symbol is, with this symbol I look for its information (asset, free, locked) in the third array, being the symbol (second array) === asset (third array).

Once I have the information of a currency in the three arrays, there I must merge the data in the first array with the second array (the value of the first array must be changed to cost)

Here I show you the desired result:

[
   {
    "asset": "BTC",
    "free": "0.01054959",
    "locked": "0.00000000",
    "cost": "55974.56000000"
  },
  {
    "asset": "LTC",
    "free": "0.00000000",
    "locked": "0.00000000",
    "cost": "0.00481700"
  },
  {
    "asset": "ETH",
    "free": "0.00000000",
    "locked": "0.00000000",
    "cost": "0.03907000"
  }
]

I have a function that is used to merge two arrays but this one is for 3 arrays and one of the additional arrays has to merge with a different name of the tributes ... — Denis Alayza, Apr 20 '21 at 02:15
const fn = curry((keys, data) => pipe( indexBy(prop('symbol')), props(values(keys)) )(data)); — Denis Alayza, Apr 20 '21 at 02:15

Som Shekhar Mukherjee · Answer 1 · 2021-04-20T20:43:42.613

Solution using Javascript `Map`

I would recommend creating a Map out of zs array which maps baseAsset to symbol.

And then looping over ys and constructing the cost field using the Map and the xs array.

const 
   xs = {ETHBTC: "0.03907000", LTCBTC: "0.00481700", BNBBTC: "0.00901600", NEOBTC: "0.00200600", QTUMETH: "0.00902000", EOSETH: "0.00310500", SNTETH: "0.00008902", BNTETH: "0.00308500", BCCBTC: "0.07908100", GASBTC: "0.00032410", BNBETH: "0.23078000", BTCUSDT: "55974.56000000", ETHUSDT: "2186.71000000", HSRBTC: "0.00041400", OAXETH: "0.00017780", DNTETH: "0.00002801", MCOETH: "0.00577200"},
   ys = [{asset: "BTC", free: "0.01054959", locked: "0.00000000"}, {asset: "LTC", free: "0.00000000", locked: "0.00000000"}, {asset: "ETH", free: "0.00000000", locked: "0.00000000"}],
   zs = [{symbol: "ETHBTC", status: "TRADING", baseAsset: "ETH", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00100000", maxQty: "100000.00000000", stepSize: "0.00100000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "1784.90123628", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "LTCBTC", status: "TRADING", baseAsset: "LTC", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "10633.87362057", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BNBBTC", status: "TRADING", baseAsset: "BNB", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000010", maxPrice: "100000.00000000", tickSize: "0.00000010"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "3604.01847116", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BTCUSDT", status: "TRADING", baseAsset: "BTC", baseAssetPrecision: 8, quoteAsset: "USDT", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.01000000", maxPrice: "1000000.00000000", tickSize: "0.01000000"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00000100", maxQty: "9000.00000000", stepSize: "0.00000100"}, {filterType: "MIN_NOTIONAL", minNotional: "10.00000000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "82.65659251", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}],
      
   zsMap = new Map(zs.map(({baseAsset, symbol}) => [baseAsset, symbol])),
   desired = ys.map(o => ({...o, cost: xs[zsMap.get(o.asset)]}))

console.log(desired)

Same solution but using IIFE

const 
   xs = {ETHBTC: "0.03907000", LTCBTC: "0.00481700", BNBBTC: "0.00901600", NEOBTC: "0.00200600", QTUMETH: "0.00902000", EOSETH: "0.00310500", SNTETH: "0.00008902", BNTETH: "0.00308500", BCCBTC: "0.07908100", GASBTC: "0.00032410", BNBETH: "0.23078000", BTCUSDT: "55974.56000000", ETHUSDT: "2186.71000000", HSRBTC: "0.00041400", OAXETH: "0.00017780", DNTETH: "0.00002801", MCOETH: "0.00577200"},
   ys = [{asset: "BTC", free: "0.01054959", locked: "0.00000000"}, {asset: "LTC", free: "0.00000000", locked: "0.00000000"}, {asset: "ETH", free: "0.00000000", locked: "0.00000000"}],
   zs = [{symbol: "ETHBTC", status: "TRADING", baseAsset: "ETH", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00100000", maxQty: "100000.00000000", stepSize: "0.00100000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "1784.90123628", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "LTCBTC", status: "TRADING", baseAsset: "LTC", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "10633.87362057", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BNBBTC", status: "TRADING", baseAsset: "BNB", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000010", maxPrice: "100000.00000000", tickSize: "0.00000010"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "3604.01847116", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BTCUSDT", status: "TRADING", baseAsset: "BTC", baseAssetPrecision: 8, quoteAsset: "USDT", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.01000000", maxPrice: "1000000.00000000", tickSize: "0.01000000"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00000100", maxQty: "9000.00000000", stepSize: "0.00000100"}, {filterType: "MIN_NOTIONAL", minNotional: "10.00000000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "82.65659251", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}],
  
   desired = ((zsMap) =>
     ys.map(o => ({ ...o, cost: xs[zsMap.get(o.asset)] })))(
     new Map(zs.map(({ baseAsset, symbol }) => [baseAsset, symbol]))
   );

console.log(desired);

With javascript I did it but I used map and filter for the 3 arrays, it worked but the response time was very delayed ... — Denis Alayza, Apr 20 '21 at 15:32
Have tried using the approach that I suggested using the `Map` data structure? @DenisAlayza It should perform better with `Maps`. — Som Shekhar Mukherjee, Apr 20 '21 at 16:30
The second approach does not do what you'd like. It reconstructs the `Map` for every entry in `ys`. It needs to be moved up the way it was in the original. I'll add an update to my answer to demonstrate. — Scott Sauyet, Apr 20 '21 at 17:45
But I like the idea. I've updated my answer to add a version using a Map. — Scott Sauyet, Apr 20 '21 at 17:53
@ScottSauyet Thanks for pointing that out, I completely missed that. I've updated my solution to use an IIFE. — Som Shekhar Mukherjee, Apr 20 '21 at 18:04

Scott Sauyet · Answer 2 · 2021-04-20T18:39:20.280

My first approach wouldn't use Ramda, as this seems fairly straightforward in vanilla JS:

const combine = (xs, ys, zs) => 
  ys .map ((
    {asset, ...rest}, _i, _arr, 
    {symbol = ''} = zs .find (({baseAsset}) => baseAsset == asset),
    cost = xs [symbol]
  ) => ({asset, ...rest, cost}))

const xs = {ETHBTC: "0.03907000", LTCBTC: "0.00481700", BNBBTC: "0.00901600", NEOBTC: "0.00200600", QTUMETH: "0.00902000", EOSETH: "0.00310500", SNTETH: "0.00008902", BNTETH: "0.00308500", BCCBTC: "0.07908100", GASBTC: "0.00032410", BNBETH: "0.23078000", BTCUSDT: "55974.56000000", ETHUSDT: "2186.71000000", HSRBTC: "0.00041400", OAXETH: "0.00017780", DNTETH: "0.00002801", MCOETH: "0.00577200"}
const ys = [{asset: "BTC", free: "0.01054959", locked: "0.00000000"}, {asset: "LTC", free: "0.00000000", locked: "0.00000000"}, {asset: "ETH", free: "0.00000000", locked: "0.00000000"}]
const zs = [{symbol: "ETHBTC", status: "TRADING", baseAsset: "ETH", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00100000", maxQty: "100000.00000000", stepSize: "0.00100000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "1784.90123628", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "LTCBTC", status: "TRADING", baseAsset: "LTC", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "10633.87362057", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BNBBTC", status: "TRADING", baseAsset: "BNB", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000010", maxPrice: "100000.00000000", tickSize: "0.00000010"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "3604.01847116", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BTCUSDT", status: "TRADING", baseAsset: "BTC", baseAssetPrecision: 8, quoteAsset: "USDT", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.01000000", maxPrice: "1000000.00000000", tickSize: "0.01000000"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00000100", maxQty: "9000.00000000", stepSize: "0.00000100"}, {filterType: "MIN_NOTIONAL", minNotional: "10.00000000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "82.65659251", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}]

console .log (combine (xs, ys, zs))

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We map the elements of your second array, keeping all their properties and searching the third array for a record whose baseAsset equals the asset of the current node, then look up this new record's symbol property in the first array.

The style may feel unfamiliar. I much prefer working with expressions rather than statements, so I use additional defaulted parameters rather than local variables. This requires supplying dummy values for the extra arguments Array.prototype.map supplies to its callback. That's _i and _arr.

While it might be interesting to see if there's a cleaner Ramda version, I'm not particularly hopeful. Ramda's map function would improve this a bit, because it wouldn't need _i and _arr, but that's fairly minor.

Update

Som Shekhar Mukherjee makes a good point about using a Map to avoid repeated searches of the second list. This version does that, keeping the Map around only for the call to combine. But of course if you needed to do this multiple times, you might want to store that Map externally, and pass it in place of zs. The design is as before except this time we add a new defaulted parameter map to the initial call.

const combine = (xs, ys, zs, map = new Map (zs .map (({baseAsset, symbol}) => [baseAsset, symbol]))) => 
  ys .map ((
    {asset, ...rest}, _i, _arr, 
    cost = xs [map .get (asset)]
  ) => ({asset, ...rest, cost}))


const xs = {ETHBTC: "0.03907000", LTCBTC: "0.00481700", BNBBTC: "0.00901600", NEOBTC: "0.00200600", QTUMETH: "0.00902000", EOSETH: "0.00310500", SNTETH: "0.00008902", BNTETH: "0.00308500", BCCBTC: "0.07908100", GASBTC: "0.00032410", BNBETH: "0.23078000", BTCUSDT: "55974.56000000", ETHUSDT: "2186.71000000", HSRBTC: "0.00041400", OAXETH: "0.00017780", DNTETH: "0.00002801", MCOETH: "0.00577200"}
const ys = [{asset: "BTC", free: "0.01054959", locked: "0.00000000"}, {asset: "LTC", free: "0.00000000", locked: "0.00000000"}, {asset: "ETH", free: "0.00000000", locked: "0.00000000"}]
const zs = [{symbol: "ETHBTC", status: "TRADING", baseAsset: "ETH", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00100000", maxQty: "100000.00000000", stepSize: "0.00100000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "1784.90123628", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "LTCBTC", status: "TRADING", baseAsset: "LTC", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "10633.87362057", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BNBBTC", status: "TRADING", baseAsset: "BNB", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000010", maxPrice: "100000.00000000", tickSize: "0.00000010"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "3604.01847116", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BTCUSDT", status: "TRADING", baseAsset: "BTC", baseAssetPrecision: 8, quoteAsset: "USDT", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.01000000", maxPrice: "1000000.00000000", tickSize: "0.01000000"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00000100", maxQty: "9000.00000000", stepSize: "0.00000100"}, {filterType: "MIN_NOTIONAL", minNotional: "10.00000000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "82.65659251", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}]

console .log (
  combine (xs, ys, zs)
)

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(I also modified the handling of the named properties from xs, inspired again by Som.)

Update 2

I did the last one in too much of a hurry. Now with cost so easy to find, we don't need the extra map callback parameter either, and this becomes simpler still:

const combine = (xs, ys, zs, 
  map = new Map (zs .map (({baseAsset, symbol}) => [baseAsset, symbol]))
) => 
  ys .map (({asset, ...rest}) => ({asset, ...rest, cost: xs [map .get (asset)]}))


const xs = {ETHBTC: "0.03907000", LTCBTC: "0.00481700", BNBBTC: "0.00901600", NEOBTC: "0.00200600", QTUMETH: "0.00902000", EOSETH: "0.00310500", SNTETH: "0.00008902", BNTETH: "0.00308500", BCCBTC: "0.07908100", GASBTC: "0.00032410", BNBETH: "0.23078000", BTCUSDT: "55974.56000000", ETHUSDT: "2186.71000000", HSRBTC: "0.00041400", OAXETH: "0.00017780", DNTETH: "0.00002801", MCOETH: "0.00577200"}
const ys = [{asset: "BTC", free: "0.01054959", locked: "0.00000000"}, {asset: "LTC", free: "0.00000000", locked: "0.00000000"}, {asset: "ETH", free: "0.00000000", locked: "0.00000000"}]
const zs = [{symbol: "ETHBTC", status: "TRADING", baseAsset: "ETH", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00100000", maxQty: "100000.00000000", stepSize: "0.00100000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "1784.90123628", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "LTCBTC", status: "TRADING", baseAsset: "LTC", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000100", maxPrice: "100000.00000000", tickSize: "0.00000100"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "10633.87362057", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BNBBTC", status: "TRADING", baseAsset: "BNB", baseAssetPrecision: 8, quoteAsset: "BTC", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.00000010", maxPrice: "100000.00000000", tickSize: "0.00000010"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.01000000", maxQty: "100000.00000000", stepSize: "0.01000000"}, {filterType: "MIN_NOTIONAL", minNotional: "0.00010000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "3604.01847116", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}, {symbol: "BTCUSDT", status: "TRADING", baseAsset: "BTC", baseAssetPrecision: 8, quoteAsset: "USDT", quotePrecision: 8, quoteAssetPrecision: 8, baseCommissionPrecision: 8, quoteCommissionPrecision: 8, orderTypes: ["LIMIT", "LIMIT_MAKER", "MARKET", "STOP_LOSS_LIMIT", "TAKE_PROFIT_LIMIT"], icebergAllowed: true, ocoAllowed: true, quoteOrderQtyMarketAllowed: true, isSpotTradingAllowed: true, isMarginTradingAllowed: true, filters: [{filterType: "PRICE_FILTER", minPrice: "0.01000000", maxPrice: "1000000.00000000", tickSize: "0.01000000"}, {filterType: "PERCENT_PRICE", multiplierUp: "5", multiplierDown: "0.2", avgPriceMins: 5}, {filterType: "LOT_SIZE", minQty: "0.00000100", maxQty: "9000.00000000", stepSize: "0.00000100"}, {filterType: "MIN_NOTIONAL", minNotional: "10.00000000", applyToMarket: true, avgPriceMins: 5}, {filterType: "ICEBERG_PARTS", limit: 10}, {filterType: "MARKET_LOT_SIZE", minQty: "0.00000000", maxQty: "82.65659251", stepSize: "0.00000000"}, {filterType: "MAX_NUM_ORDERS", maxNumOrders: 200}, {filterType: "MAX_NUM_ALGO_ORDERS", maxNumAlgoOrders: 5}], permissions: ["SPOT", "MARGIN"]}]

console .log (
  combine (xs, ys, zs)
)

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Hey Scott! I would prefer using `Map` instead of finding in the array again and again, which could be bad in terms of performance if the array is of considerable length. Could you please review my solution? — Som Shekhar Mukherjee, Apr 20 '21 at 13:48
@SomShekharMukherjee: Yes, I would use a map or object for lookups if I found the original too slow. But without more understanding, I don't know if that should be written externally to the function to reuse across multiple calls to `combine`, or whether it could go inside `combine`. I'll look at yours. — Scott Sauyet, Apr 20 '21 at 17:43
Added an updated version, and the Map actually ended up simplifying the code. — Scott Sauyet, Apr 20 '21 at 18:40

Concat objects in ramda (project nodejs)

2 Answers2

Solution using Javascript Map

Same solution but using IIFE

Update

Update 2

Solution using Javascript `Map`