在JS对象数组中，我应该使用键来标识每个对象吗？

Question

I'm still learning javascript patterns, and I'm curious about this one.

If I have an array of objects, should I make the array of objects not have keys (Example A), or use their keys (Example B)?

An array of objects without any key:

var soylent_green_candidates = [{
  id: 12341,
  name: "Don",
  gender: "Male",
  weapon_of_choice: "Kangaroo Cannon"
},
{
  id: 24325,
  name: "Jimmy",
  gender: "Male",
  weapon_of_choice: "Sushi Blaster"
},
...
]

Or an array of objects using the unique ID's as keys:

var soylent_green_candidates = [ 
12341: {
  name: "Don",
  gender: "Male",
  weapon_of_choice: "Kangaroo Cannon"
},
24325: {
  name: "Jimmy",
  gender: "Male",
  weapon_of_choice: "Sushi Blaster"
},
...
]

Answer 1

Your second example is invalid, so that should put the question to sleep.

In Javascript you have the option of arrays , which are sorted but essentially "key less". Each array entry can only be accessed by its numeric index, period.
The other option is objects , which have no guaranteed order but are keyed by arbitrary values.

['foo', 'bar', 'baz']
{ foo : 'bar', baz : 42 }

You make the choice based on these two criteria, order and requirement for keys.

(Note: while you can use arbitrary numeric indices for arrays, you can't do so using the literal syntax [..] , and it's not usually a good idea. If you need explicit keys, you want objects.)