You! Yes, you! You’re the kind of hipster that still thinks Williamsburg or Dalston are cool, aren’t you? You’re still using Underscore.js aren’t you? LOSER!
Stop it immediately. You’ll get at least 10 milliseconds page load performance if you use Lo-Dash, a drop-in replacement for Underscore.js with a few added features. I’m almost reluctant to tell you about it in case you tell your Pabst-drinking loser friends about it.