SHA3 512-bit encoding function in JavaScript, expanded version filip dimitrovsky's answer on stackoverflow using the browser's crypto API

sha-512.js

// 13 May 2023
// SHA3 512-bit encoding function in JavaScript
// expanded version of filip dimitrovsky's answer on stackoverflow
// using the browser's crypto API
// https://stackoverflow.com/a/55926440

function sha512(src, fn) {
  var s = '' + src;
  var e = new TextEncoder('utf-8');
  var c = e.encode(s);
  var p = crypto.subtle.digest('SHA-512', c);

  p.then(function (r) {
    var b = new Uint8Array(r);

    var a = [].map.call(b, function (v) {
      return ('00' + v.toString(16)).slice(-2)
    });-

    var c = a.join('');

    typeof fn == 'function'
      ? fn(c)
      : console.log({ code: c });
  });
};

/* test it out */

var src = "my string for encoding";

sha512(src);
// logs...

sha512(src, function (code) {
  console.warn({ code });
});
// warns...