Question

According to the $.grep() documentation I would think that the code below would print 2. But instead it’s printing 0,1,2. See this fiddle. Am I going loco?

var arr = [0, 1, 2];

$.grep( arr, function(n,i) {
    return n > 1;
});

$('body').html( arr.join() );

Answer 1

$.grep returns a new array – it doesn’t modify your existing one.

You want

arr = $.grep( arr, function(n,i) {
    return n > 1;
});

Check out the $.grep docs for more information