How to convert nested array to normal array and change types?

Question

I have the following structure of array:

[{Id: Number, Attributes: {Name: String, Age: String, Height: String}}]

And I want to convert it into the:

[{Id: Number, Name: String, Age: Number, Height: Number}]

Also how to convert "2018-12-12 09:19:40" to an Date object? While converting the entire array.

How to do this? Using lodash or not.

Nenad Vracar · Accepted Answer · 2018-12-13T11:42:16.373

4

You could use map with spread syntax ....

const data = [{Id: 'Number', Attributes: {Name: 'String', Age: 'String', Height: 'String'}}]
const res = data.map(({Attributes, ...rest}) => ({...rest, ...Attributes}))
console.log(res)

To convert the data types you could use some nested destructuring.

const data = [{Id: 'Number', Attributes: {Name: 'String', Age: '20', Height: '123'}}]
const res = data.map(({Attributes: {Age, Height, ...attr}, ...rest}) => ({
  ...rest,
  ...attr,
  Age: +Age,
  Height: +Height
}))
console.log(res)

edited Dec 13 '18 at 11:42

answered Dec 13 '18 at 11:33

Nenad Vracar

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but how to convert data type doing this? – Dec 13 '18 at 11:37
what about Date type? how to convert to it? – Dec 13 '18 at 12:29
1

Could you provide an example? – Nenad Vracar Dec 13 '18 at 12:31
i have added it to my question – Dec 13 '18 at 12:36
ok, and what about if i want to also convert data type of 'Id'? – Dec 13 '18 at 12:46
1

Are you using mongoose? There is no Id type in plain javascript – Nenad Vracar Dec 13 '18 at 12:47
in my example of input array there is 'Id: Number' – Dec 13 '18 at 12:57
could you answer? – Dec 14 '18 at 11:14
1

@Chris K. Sry I am not sure what are you asking, if the id type in input is number it will stay number as you can see here https://jsfiddle.net/sfu9kt5h/74/, but there is no ID type in javascript. – Nenad Vracar Dec 14 '18 at 11:17
1

But lets say you just want to convert Id from number to string then you could do this https://jsfiddle.net/sfu9kt5h/75/ – Nenad Vracar Dec 14 '18 at 11:21
yeah i know it will be a number, but i am asking if i can convert it to string for example, thanks for your answer – Dec 14 '18 at 11:53

Akshay Rajput · Answer 2 · 2018-12-13T11:46:24.680

0

If you want to convert an object to an array(change type) you can try Object.entries(); In Es2017 There is a property which can be useful in these case, (Object.entries());

const cars = {"BMW": 3, "Tesla": 2, "Audi": 5}
const map = new Map(Object.entries(cars));
console.log(map);

Hope this helps

edited Dec 13 '18 at 11:46

answered Dec 13 '18 at 11:41

Akshay Rajput

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How to convert nested array to normal array and change types?

2 Answers2