Javascript ArrayBuffer to Hex

Question

I\'ve got a Javascript ArrayBuffer that I would like to be converted into a hex string.

Anyone knows of a function that I can call or a pre written function already

Answer 1

This one's inspired by Sam Claus' #1 which is indeed the fastest method on here. Still, I've found that using plain string concatenation instead of using an array as a string buffer is even faster! At least it is on Chrome. (which is V8 which is almost every browser these days and NodeJS)

const len = 0x100, byteToHex = new Array(len), char = String.fromCharCode;
let n = 0;
for (; n < 0x0a; ++n) byteToHex[n] = '0' + n;
for (; n < 0x10; ++n) byteToHex[n] = '0' + char(n + 87);
for (; n < len; ++n) byteToHex[n] = n.toString(16);
function byteArrayToHex(byteArray) {
    const l = byteArray.length;
    let hex = '';
    for (let i = 0; i < l; ++i) hex += byteToHex[byteArray[i] % len];
    return hex;
}
function bufferToHex(arrayBuffer) {
    return byteArrayToHex(new Uint8Array(arrayBuffer));
}