Equivalent of Underscore _.pluck in pure JavaScript

Question

I\'m trying to recreate the Underscore pluck function using pure JS. However, I keep getting an array of undefineds being returned, instead of the actual values from the pr

Answer 1

How about a reduce:

$.pluck = function(arr, key) { 
    return arr.reduce(function(p, v) { 
      return p.concat(v[key]); 
    }, []); 
}

var people = [
  { name: 'James', age: 26 }, 
  { name: 'Fred', age: 56 }
];

$.pluck(people, 'age');
=> [26, 56]

$.pluck(people, 'name');
=> ['James', 'Fred']