What is the in-place alternative to Array.prototype.filter()

Question

I\'ve got an array that I would like to remove some elements from. I can\'t use Array.prototype.filter(), because I want to modify the array in place (because i

Answer 1

What you could use

• filter returns an array with the same elements, but not necesserily all.
• map returns something for each loop, the result is an array with the same length as the source array
• forEach returns nothing, but every element is processes, like above.
• reduce returns what ever you want.
• some/every returns a boolean value

But nothing from above is mutilating the original array in question of length in situ.

I suggest to use a while loop, beginning from the last element and apply splice to the element, you want to remove.

This keeps the index valid and allows to decrement for every loop.

Example:

var array = [0, 1, 2, 3, 4, 5],
    i = array.length;

while (i--) {
    if (array[i] % 2) {
        array.splice(i, 1);
    }
}
console.log(array);