Bit test in js

bit.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);
}