get value with string key in javascript

Question

I can't figure out how to get an object property using a string representation of that property's name in javascript. For example, in the following script:

consts = {'key' : 'value'}

var stringKey = 'key';

alert(consts.???);

How would I use stringKey to get the value value to show in the alert?

score 38 · Accepted Answer · answered Jun 14 '13 at 19:37

38

Use the square bracket notation []

var something = consts[stringKey];

answered Jun 14 '13 at 19:37

MrCode

61,589
10
82
110

score 5 · Answer 2 · edited May 23 '17 at 11:53

5

Javascript objects are like simple HashMaps:

var consts = {};

consts['key'] = "value";
if('key' in consts) {      // true
   alert(consts['key']);   // >> value
}

See: How is a JavaScript hash map implemented?

edited May 23 '17 at 11:53

Community

1
1

answered Jun 14 '13 at 20:23

Jóni Lourenço

117
4

get value with string key in javascript

2 Answers2