Convert a 32bit integer into 4 bytes of data in javascript

Question

I was asked to convert the integers to 32-bit binary numbers. So is used integer.toString(2) and got the required value in 32-bit binary format of 0\'sand 1\'s. But

Answer 1

SEIAROTg's answer does not output a string. I have theroughly tested with both positive and negative numbers and this code will give you a 4 byte string output representing the number in big endien format(2's compliment 0xFFFFFFFF = -1).

var toBytesInt32=function(num) {
    var ascii='';
    for (let i=3;i>=0;i--) {
        ascii+=String.fromCharCode((num>>(8*i))&255);
    }
    return ascii;
};

by the way if you want to go the other way around you can use

var fromBytesInt32=function(numString) {
    var result=0;
    for (let i=3;i>=0;i--) {
        result+=numString.charCodeAt(3-i)<<(8*i);
    }
    return result;
};

to convert a 4 byte string to an integer