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 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}
];

• javascript
• jquery
• arrays

• 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 Commented Sep 4, 2013 at 5:05

2 Answers 2

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

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