Javascript bitf*ckery because I hate bits and reading data sheets for i2c stuffs and I'm also jealous of python etc

bitmagic-the-freewheelin-bitmiser.js

// console.log(bitmagic("b[1010]d[3,2]h[02,2]"));
// console.log(bitmagic("b[10]d[1,2]h[0A]"));

/**
 * Bitmagic the Freewheelin' bitmiser
 * 
 * Use any combination of bits, numbers or hex and output a nice-lookin' byte
 * 
 * Usage: b[binary]d[decimal,padding?]h[hex,padding?]
 *
 * b[1010]d[3,2]h[02,2] = 10101110
 * b[10]d[1,2]h[0A] = 10011010
 *
 * {b, d, h}
 */
function bitmagic(str) {
  let matches = [...str.matchAll(/([dbh]{1})\[([^\]]+)\]/g)];
  
  let b = matches.reduce((a, e) => {
    let [val, pad] = e[2].split(',');
    
    if (e[1] === "b") {
      // nothing to do
      a += `${val}`;
    } else if (e[1] === "d") {
      a += (val >>> 0).toString(2).padStart(pad ? pad : 0, '0');
    } else if (e[1] === "h") {
      a += `${parseInt(val, 16).toString(2).padStart(pad ? pad : 0, '0')}`
    }
    
    return a;
  }, "");
  
  return {b: b, d: parseInt(b, 2), h: '0x' + parseInt(b,2).toString(16)};
}