Hash keys / values as array [duplicate]

Question

I cannot find the JavaScript equivalent of PHP array_keys() / array_values().

For people unfamiliar with PHP given the following JavaScript hash:

var myHash = {"apples": 3, "oranges": 4, "bananas": 42} 

How can I get an array of keys, i.e.,

["apples", "oranges", "bananas"] 

The same question with the values, i.e.,

[3, 4, 42] 

jQuery can be used.

Answer 1

In ES5 supported (or shimmed) browsers...

var keys = Object.keys(myHash);  var values = keys.map(function(v) { return myHash[v]; }); 

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Shims from MDN...

• Object.keys

• Array.prototype.map

Answer 2

var a = {"apples": 3, "oranges": 4, "bananas": 42};      var array_keys = new Array(); var array_values = new Array();  for (var key in a) {     array_keys.push(key);     array_values.push(a[key]); }  alert(array_keys); alert(array_values);