underscore.js _.pluck[Collections]

A convenient version of what is perhaps the most common use-case for map: extracting a list of property values.

很方便的为你提供一个获取列表值的方法

var stooges = [{name : 'moe', age : 40}, {name : 'larry', age : 50}, {name : 'curly', age : 60}];
_.pluck(stooges, 'name');
=> ["moe", "larry", "curly"]

源码:

  _.pluck = function(obj, key) {
    return _.map(obj, function(value){ return value[key]; });
  };