Question

I found this example that says:

var arr=$.map([0,1,2],function(n){
    return [n,n+1];
});

Will make arr a 6 item array. However, I don’t understand why it isn’t [[x,y],[x,y],[x,y]]

I need to know step by step what just happened. This map functions seems very useful, I would hate to don’t use it simply because I don’t understand its behavior.

Answer 1

$.map flattens the returned array:

A returned array will be flattened into the resulting array.

Source: http://api.jquery.com/jQuery.map/