get value with string key in javascript [duplicate]

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?

MrCode · Accepted Answer · 2013-06-14 19:37:52Z

42

Use the square bracket notation []

var something = consts[stringKey];

answered Jun 14, 2013 at 19:37

MrCode

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Comments

Community · Accepted Answer · 2017-05-23 11:53:56Z

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, 2017 at 11:53

CommunityBot

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answered Jun 14, 2013 at 20:23

Jóni Lourenço

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