How to get certain part of object array as a new array?

Question

I have an Object array:

let products = [{ code: 'a', num: 1 }, { code: 'b', num: 2 }];

I want to get the codes array: ['a', 'b'].

This is how I am doing now using lodash:

let codes = [];
_.forEach(products, (product) => {
  codes.push(product.code);
});

Is there any smart way to do this?

Remi Guan · Accepted Answer · 2016-05-20 03:48:34Z

3

Yeah, there is a pure JavaScript solution:

let codes = products.map(obj => obj.code);

edited May 20, 2016 at 3:48

Remi Guan

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answered May 20, 2016 at 3:45

Washington Guedes

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Comments

ryeballar · Accepted Answer · 2016-05-20 03:49:10Z

2

You can use map() for lodash:

let codes = _.map(products, 'code');

let products = [{ code: 'a', num: 1 }, { code: 'b', num: 2 }];

let codes = _.map(products, 'code');

document.write('<pre>' + JSON.stringify(codes, 0, 4) + '</pre>');

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.12.0/lodash.js"></script>

answered May 20, 2016 at 3:49

ryeballar

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Comments

Sandeep Nayak · Accepted Answer · 2016-05-20 03:46:50Z

1

Use vanilla JavaScript Array.map

var arr = [{ code: 'a', num: 1 }, { code: 'b', num: 2 }];

var newArr = arr.map(function(obj){
  return obj.code;

})

console.log(newArr)

   var arr = [{
     code: 'a',
     num: 1
   }, {
     code: 'b',
     num: 2
   }];

   var newArr = arr.map(function(obj) {
     return obj.code;

   })

    console.log(newArr)

answered May 20, 2016 at 3:46

Sandeep Nayak

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