Simple JavaScript examples

metronome.js

var BPM = 120;
var BPB = 4;

var msFromBPM = Math.round(60000/BPM);

setInterval(function(){
  if (typeof(beat) === 'undefined') { beat = 1 };

  if (beat === 1) { console.log('BLEEP', beat) }
  else            { console.log('bloop', beat) }

  if (beat === BPB) { beat = 0 };
  beat++;

}, msFromBPM);