jashkenas/underscore — pull request #1510 by mehdishojaei (2014-03-07 20:16:51+00:00)
Title: Optimize _.omit for performance

`_.map` can be removed from implementation of `_.omit` for performance reasons.

jsPerf: [_.omit with and without _.map](http://jsperf.com/omit-without-map)