Create new array from an existing array attributes

Question

I am trying to create a new array out of limited values from an existing array. In the example below LargeArray contains many attributes – year, books, gdp and control. Lets say I want to create a new array that would only include year and gdp.

var LargeArray = [
    {year:1234, books:1200, gdp:1200, control:1200}, 
    {year:1235, books:1201, gdp:1200, control:1200}, 
    {year:1236, books:1202, gdp:1200, control:1200}
];

The new array I am trying to get, would look like this:

var NewArray = [
    {year:1234, gdp:1200},
    {year:1235, gdp:1200},
    {year:1236, gdp:1200}
];

I would like to use Jquery to create the new array, i am not sure if map function would help. If it's better with plain javaScript its great too. — Rohan Sandeep
– Rohan Sandeep, Commented Sep 4, 2013 at 5:05

Arun P Johny · Accepted Answer · 2013-09-04 05:09:59Z

5

use $.map()

var LargeArray = [{year:1234, books:1200, gdp:1200, control:1200}, {year:1235, books:1201, gdp:1200, control:1200}, {year:1236, books:1202, gdp:1200, control:1200}, {year:1237, books:1203, gdp:1200, control:1200}, {year:1238, books:1204, gdp:1200, control:1200}];
var NewArray = $.map(LargeArray, function (value) {
    return {
        year: value.year,
        gdp: value.gdp
    }
})

Demo: Fiddle

edited Sep 4, 2013 at 5:09

answered Sep 4, 2013 at 5:04

Arun P Johny

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2 Comments

Sterling Archer Over a year ago

I just looked up $.map and it mentioned running the array through $.makeArray -- would this be relevant here?

Arun P Johny Over a year ago

@RUJordan no it is not since the OP has an actual array

c.P.u1 · Accepted Answer · 2013-09-04 05:42:25Z

3

Using Array.prototype.map

var newArray = largeArray.map(function(obj) {
  return { year: obj.year, gdp: obj.gdp };
});

Note: Array.prototype.map is a recent addition. Use the shim from MDN to support older browsers.

jsFiddle Demo

edited Sep 4, 2013 at 5:42

answered Sep 4, 2013 at 5:21

c.P.u1

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