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jQuery.map - Practical uses for the function?

rated 0 times [ 108] [ 7] / answers: 1 / hits: 38570 / 16 Years ago, thu, april 2, 2009, 12:00:00

I am trying to get a better understanding of the jQuery.map function.

So in general terms .map takes a array and maps it to another array of items.

easy example:

$.map([0,1,2], function(n){

    return n+4;

});

results in [4,5,6]

I think I understand what it does. I want to under why would someone need it. What is the practical use of this function? How are you using this in your code?

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answered 16 Years ago clarissakourtneyb · Accepted Answer

$.map is all about converting items in a set.

As far as the DOM, I often use it to quickly pluck out values from my elements:

var usernames = $('#user-list li label').map(function() {

    return this.innerHTML;

})

The above converts the <label> elements inside a list of users to just the text contained therein. Then I can do:

alert('The following users are still logged in: ' + usernames.join(', '));