Returning only certain properties from an array of objects in Javascript

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/24440403/returning-only-certain-properties-from-an-array-of-objects-in-javascript

Answer 1

This is easily done with the Array.prototype.map() function:

var keyArray = objArray.map(function(item) { return item["key"]; });

If you are going to do this often, you could write a function that abstracts away the map:

function pluck(array, key) {
  return array.map(function(item) { return item[key]; });
}

In fact, the Underscore library has a built-in function called pluck that does exactly that.