Match elements of an array from a JSON Array of Objects using Chai

Question

Let's say I have an array

let array_of_string = ['John','Jack','Smith','Ryan'];

How can I assert that these keys are included in JSON array of objects where the JSON is something like this

[ {
    "person_name": "Jake",
    "person_id": '1234',
    "employee_type": "Regular"
}, {
    "person_name": "Adam",
    "person_id": '1245',
    "employee_type": "Contractor"
}, {
    "person_name": "John",
    "person_id": '2342',
    "employee_type": "Regular"
}, {
    "person_name": "Smith",
    "person_id": '3456',
    "employee_type": "Contractor"
}, {
    "person_name": "Ryan",
    "person_id": '0123',
    "employee_type": "Regular"
} ]

I am using Chai to have the assertions. Using include and deep.Equal doesn't seem to work.

The JSON Array is response of an API. So currently I tried this

it('checks if the elements are in API response', () => {
  return response.then(function(resp){
    expect(resp).to.be.an('array').that.includes(array_of_string )
  })
})

you just want to check if all the values of `array_of_string` exist in that map ? right ? — Muhammad Usman, Apr 17 '18 at 12:39
have you checked [this](https://stackoverflow.com/a/49878890/6804958) answer ? — Muhammad Usman, Apr 17 '18 at 13:04

Muhammad Usman · Answer 1 · 2018-04-17T13:13:03.317

Well, this is how I would have done it. And This is in plain JS

'use strict';

var array_of_string = ['John', 'Jack', 'Smith', 'Ryan', 'Usman'];
var list = [{
    "person_name": "Jake",
    "person_id": '1234',
    "employee_type": "Regular"
}, {
    "person_name": "Adam",
    "person_id": '1245',
    "employee_type": "Contractor"
}, {
    "person_name": "John",
    "person_id": '2342',
    "employee_type": "Regular"
}, {
    "person_name": "Smith",
    "person_id": '3456',
    "employee_type": "Contractor"
}, {
    "person_name": "Ryan",
    "person_id": '0123',
    "employee_type": "Regular"
}];
var b = true;
array_of_string.forEach(function (name) {

    if (list.some(e=>e.person_name === name)) {} else {
        b = false;
        return false;
    }
});

console.log(b);

If all the elements of array_of_string exists as person_name property in that, this should log true else false.

Couldn't you use `Array.prototype.every` or `Array.prototype.some`? — Mr. Polywhirl, Apr 17 '18 at 13:07
sure, I could do that. thanks for mentioning. I almost skipped `Array.prototype.some` when writing answer `:p` — Muhammad Usman, Apr 17 '18 at 13:10

score 1 · Accepted Answer · answered Apr 17 '18 at 13:52

I changed "Jack" to "Jake" in the list of names and removed "Adam" from the response data to ensure that every name appeared in the data to prove the function's use below.

The JS Doc preceding the function describes what it does.

/*
 * Check if each value exist (at least once) in a list (by its key).
 * @param {object[]} list - List of objects.
 * @param {string[]} vals - List of values to search for.
 * @param {string}   key  - Key for each object to check the value.
 * @return {boolean} Returns wheteher all values exist in the list.
 */
const fn = (list, vals, key) => vals.every(val => list.some(e => e[key] === val));

var names = [ 'Jake', 'John', 'Smith', 'Ryan' ];
var responseData = [{
  "person_name": "Jake",
  "person_id": '1234',
  "employee_type": "Regular"
}, {
  "person_name": "John",
  "person_id": '2342',
  "employee_type": "Regular"
}, {
  "person_name": "Smith",
  "person_id": '3456',
  "employee_type": "Contractor"
}, {
  "person_name": "Ryan",
  "person_id": '0123',
  "employee_type": "Regular"
}];

// names.every(name => responseData.some(p => p['person_name'] === name));
console.log('All names present?', fn(responseData, names, 'person_name'));

.as-console-wrapper { top: 0; max-height: 100% !important; }

Smooth. Thanks. This is what I needed. – demouser123 Apr 17 '18 at 14:52 — demouser123, Apr 17 '18 at 14:52

score 0 · Answer 3 · answered Apr 18 '18 at 06:04

0

You can directly use Chai assertion on Chakram response.

 const namesArray = [];
 resp.map(person => namesArray.push(person.person_name));
 names.every(name => expect(namesArray).to.include(name));
});

answered Apr 18 '18 at 06:04

Dinesh Kumar

1,694
15
22

Match elements of an array from a JSON Array of Objects using Chai

3 Answers3