javascript - remove array element on condition

Question

I was wondering how I\'d go about implementing a method in javascript that removes all elements of an array that clear a certain condition. (Preferably without using jQuery)

Answer 1

You could add your own method to Array that does something similar, if filter does not work for you.

Array.prototype.removeIf = function(callback) {
    var i = 0;
    while (i < this.length) {
        if (callback(this[i], i)) {
            this.splice(i, 1);
        }
        else {
            ++i;
        }
    }
};

To me, that's one of the coolest features of JavaScript. Ian pointed out a more efficient way to do the same thing. Considering that it's JavaScript, every bit helps:

Array.prototype.removeIf = function(callback) {
    var i = this.length;
    while (i--) {
        if (callback(this[i], i)) {
            this.splice(i, 1);
        }
    }
};

This avoids the need to even worry about the updating length or catching the next item, as you work your way left rather than right.