Test, Set, Clear & Toggle bits in JavaScript

bits.js

function bit_test(num, bit) {
    return ((num >> bit) % 2 != 0)
}

function bit_set(num, bit) {
    return num | 1 << bit;
}

function bit_clear(num, bit) {
    return num & ~(1 << bit);
}

function bit_toggle(num, bit) {
    return bit_test(num, bit) ? bit_clear(num, bit) : bit_set(num, bit);
}