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How and Why to Avoid ‘for’ Loops

Never again use for() for looping. Using for() can be dangerous, especially if you use a library which adds attributes to native objects. If you use jQuery, do loops with $.each(). Change this loop:

for (i in my_array_or_object) {
    if (my_checking_function(my_array_or_object[i])) {
        break;
    }
}

or

for (i = 0; i < my_array.length; ++i) {
    if (my_checking_function(my_array[i])) {
        break;
    }
}

to

$.each(my_array_or_object, function(i, value) {
    if (my_checking_function(value)) {
        return false;
    }

    return true;
});

If the circumstances force you to use a for() loop, do it this way:

for (i in my_object) {
    if (!my_object.hasOwnProperty(i)) {
        continue;
    }

    if (my_checking_function(my_object[i])) {
        break;
    }
}

Find more JavaScript tutorials, code snippets and samples here or more jQuery tutorials, code snippets and samples here.


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