javascript associative arrays - properties

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Hi i've took over from a developer in our company and i've come across a jS file,

it declares

JavaScript

var requiredTemplates = {};

at the top of the page, and then later on does

JavaScript

requiredTemplates.toolBarTemplate = new Application.Template() *custom class
requiredTemplates.uploadTemplate = new Application.Template()

and so on,

what i can't understand is there is no reference to requiredTemplates, and where does it get these properties from, or they simply being made on the fly, can this be done, as i always thought associative arrays needed key value pair

like

JavaScript

 var requiredTemplates = {

     uploadTemplate: value;
}

any help in clearing that up would be great :-)

Posted 7-Feb-14 1:15am

Grant Weatherston

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Maarten Kools · Accepted Answer · 2014-02-07T01:33:00

They will be created on the fly. An alternative notation would be obj[key] = value.

They are not really associative arrays actually. It's an object with properties, so you won't be able to use it in the same way you would use an array (e.g. for (var i = 0, len = obj.length; i < len; ++i) {})

If you were to loop through it, you need to do as following

JavaScript

var o = {};
o.key1 = 'value1';
o.key2 = 'value2';

for (var key in o) {
    if (!o.hasOwnProperty(key)) continue;
    
    var value = o[key];
}