save length of the array in the variable vs get it the loop

created based off of an archived jsperf benchmark: http://web.archive.org/web/20191008221700/https://jsperf.com/foreach-vs-for-loop-vs-for-in-vs-for-of-vs-babel-for-of

The purpose of this benchmark is to determine the performance differences between data properties, accessor properties and getters / setter functions.

jibadlitdesc001