How to extract value of a property as an array from an array of objects in Javascript?

Question

There is an object array:

objArray = [ { foo: 1, bar: 2}, { foo: 3, bar: 4}, { foo: 5, bar: 6} ];

How to extract the values of key foo into an arrya like [1, 3, 5]?

Answer

ES 6

By using map and => function can easily make it happen.

var result = objArray.map(a => a.foo);

ES 5

Since ES 5 doesn’t support =>, so we need a function to get the value.

var result = objArray.map(function(a) {return a.foo;});

Reference

• From an array of objects, extract value of a property as array

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