JavaScript / Node.JS to convert an object into array

Question

I have an object that looks like this:

[
  {'el': 123},
  {'el': 234}, 
  {'el': 345}
]

I would like to convert this to an array that holds just the values, and remove the extra 'el' inside:

var myArray = [ 123, 234, 345];

Is there any easy way to do this, without using JSON.parse or other JSON friendly methods? Old fashioned Javascript is what I'm looking for.

mfdebian · Accepted Answer · 2019-11-21 18:51:25Z

12

The most elegant way is:

let arrayToMap = [
  {'el' : 123},
  {'el' : 234},
  {'el' : 345}
];
let mappedArray = arrayToMap.map(item => item.el);

You can also do:

let mappedArray = [
  {'el' : 123},
  {'el' : 234},
  {'el' : 345}
].map(item => item.el);

edited Nov 21, 2019 at 18:51

mfdebian

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answered Feb 18, 2014 at 9:44

SLV

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Comments

Ravi K Thapliyal · Accepted Answer · 2013-09-30 10:11:16Z

7

You can simply loop over the array of objects and only push() the values into a new one.

var arrOfObjs = [
    { 'el' : 123 } ,
    { 'el' : 234 }, 
    { 'el' : 345 }
];

var arrOfVals = [];
for each( var obj in arrOfObjs ) {
    arrOfVals.push( obj.el );
}

for each( var val in arrOfVals ) {
    console.log( val ); // 123, 234, 345
}

answered Sep 30, 2013 at 10:11

Ravi K Thapliyal

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2 Comments

SLV Over a year ago

Why use a for loop when you have the native map function?

gabo bernal Over a year ago

var arrOfVals = arrOfObjs.map(function(it){ return it.el})

czl · Accepted Answer · 2017-09-27 06:40:54Z

4

 var rawArray = [
    {'el': 123},
    {'el': 234}, 
    {'el': 345}
 ]

 var myArray  = rawArray.map(item=>item.el);

answered Sep 27, 2017 at 6:40

czl

1173 bronze badges

Comments

frulo · Accepted Answer · 2017-09-27 06:52:32Z

0

const _ = require( 'lodash' );
const mappedArray = _.map( arrayToMap, 'el' )

answered Sep 27, 2017 at 6:52

frulo

914 bronze badges

1 Comment

EAmez Over a year ago

You should add an explanation about what your code does. I guess it's loading a library, but it's name gives no clue about it's functionality.

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