Test speed and performa Squirrelly

Test performance of different ways of get just one particular DOM element

Test performance of different ways of get just one particular DOM element

Test performance of different ways of get just one particular DOM element

Compare the new ES6 spread operator with the traditional slice() method

lodash.merge is NOT equivalent to object.assign, it does much more work so obviously it's slower tbh though lodash.assign is probably just a wrapper for object.assign for all I know