Testing performance when using a new RegExp object vs a literal regex

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Test which might be faster when using a fragement.

To test if native js implementation is better compared to Lodash

To test if native js implementation is better compared to Lodash

window.addEventListener('scroll',CallbackScroll);

ClassName vs querySelector

Fork of https://jsperf.com/dot-vs-square-bracket/5