arrays - How to get values by key in Javascript - Stack Overflow

admin管理员组

文章数量:1333442

Is there any nifty way to get values from an array of hashes:

var foo = {a: "aFirst", b: "bFirst", c: "cFirst"};
var boo = {a: "aSecond", b: "bSecond", c: "cSecond"};
var bar = {a: "aThird", b: "bThird", c: "cThird"};
var myArrOfHashes = [foo, boo, bar];

So I would expect something like:

myArrOfHashes.map(b) // => bFirst, aSecond, aThird

Is there any nifty way to get values from an array of hashes:

var foo = {a: "aFirst", b: "bFirst", c: "cFirst"};
var boo = {a: "aSecond", b: "bSecond", c: "cSecond"};
var bar = {a: "aThird", b: "bThird", c: "cThird"};
var myArrOfHashes = [foo, boo, bar];

So I would expect something like:

myArrOfHashes.map(b) // => bFirst, aSecond, aThird

• javascript
• arrays
• hash

Share Improve this question Follow asked Jun 1, 2013 at 8:19 Jackie ChanJackie Chan 2,66266 gold badges3636 silver badges7171 bronze badges 1

• 1 sorry but this line isn't clear to me (myArrOfHashes.map(b) // => bFirst, aSecond, aThird) can you elaborate more plz. – yogi Commented Jun 1, 2013 at 8:24

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 4

One easy way to do this - and many similar things - is with the Lo-Dash or Underscore libraries.

Here's an example from the Lo-Dash documentation:

var stooges = [
    { 'name': 'moe', 'age': 40 },
    { 'name': 'larry', 'age': 50 }
];

_.pluck(stooges, 'name');
// → ['moe', 'larry']

Even if you use a different approach for this particular problem, you should definitely check out these libraries. (They are very similar to each other; between the two I prefer Lo-Dash.)

Well, not quite like that, but you could try this:

myArrOfHashes.map(function(hash){ return hash.b; });

It's not 100% clear what you want, but try

var map = function(key) {
  return function(value) {
    return value[key];
  };
};

console.log(myArrOfHashes.map(map('b')));

本文标签： arraysHow to get values by key in JavascriptStack Overflow