Easy question - What does this syntax mean?

[avocado12]

Hi,

I'm sure this is very basic but it's difficult to google or search for because I'm searching for ":". Can anyone explain or point me to a reference for the ":" operator used in Javascript? For example, here it is used in a sample from the mootools framework. Thanks!

Number.extend({
    toInt: function(){
        return parseInt(this);
    },
    toFloat: function(){
        return parseFloat(this);
    },
 
    limit: function(min, max){
        return Math.min(max, Math.max(min, this));
    },
 
    round: function(precision){
        precision = Math.pow(10, precision || 0);
        return Math.round(this * precision) / precision;
    },
 
    times: function(fn){
        for (var i = 0; i < this; i++) fn(i);
    }
});

[gits]

hi ...

its an ugly (my point of view ;) ) method to write an objects methods ... have a look at the following:

// create an object with calling the constructor
var obj = new Object;
 
// the following equals the above statement using literals (always prefer that!!)
var obj = {};
 
// create an object through literals and init some values
var obj = {
    property1: 'value1',
    property2: 'value2
};
 

so i think so see that an object is created that will be passed as argument to a method called extends() and probably adds the toInt etc. methods to the Number-Object ...

kind regards