lodash.js fiddle

Added lodash from cdnjs.com in order to have lodash capabilities in chrome.

by Nalin Sajwan

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/1.2.1/lodash.min.js"></script>

JavaScript

var allTI = [
	{'_key': '25904009'},
  {'_key': '25904010'},
  {'_key': '25904013'},
  {'_key': '25904016'},
  {'_key': '25904017'},
  {'_key': '25904019'},
  {'_key': '25904020'},
  {'_key': '25904022'},
  {'_key': '25904023'},
  {'_key': '25904024'},
  {'_key': '25904025'},
  {'_key': '25904025'},
  {'_key': '25904016'},
 	{'_key': '25904009'},
  {'_key': '25904009'},
  {'_key': '25904023'},
  {'_key': '25904023'},
  {'_key': '25904023'},
  {'_key': '25904023'}
]

let checkByKey = "_key";

console.log("countby --> ", _.countBy(allTI, checkByKey));