UsefulFunctions.md

Useful functions

Parsing messages and emotes

function formatEmotes(text, emotes) {
  var splitText = text.split('');
  for (var i in emotes) {
    var e = emotes[i];
    for (var j in e) {
      var mote = e[j];
      if (typeof mote == 'string') {
        mote = mote.split('-');
        mote = [parseInt(mote[0]), parseInt(mote[1])];
        var length = mote[1] - mote[0],
          empty = Array.apply(null, new Array(length + 1)).map(function() {
            return '';
          });
        splitText = splitText
          .slice(0, mote[0])
          .concat(empty)
          .concat(splitText.slice(mote[1] + 1, splitText.length));
        splitText.splice(
          mote[0],
          1,
          '<img class="emoticon" src="http://static-cdn.jtvnw.net/emoticons/v1/' +
            i +
            '/3.0">',
        );
      }
    }
  }
  return splitText.join('');
}

Usage

var message = 'OpieOP haha Kappa lel';
var emotes = { 356: ['0-5'], 25: ['12-16'] };
var messageWithEmotes = formatEmotes(message, emotes);

Thanks @AlcaDesign for this function; more info can be found here.