rr

pow(x, -1.5) vs (1/sqrt(x) + 1/x)

Testing Array.prototype.findIndex vs a for loop over an array of objects

Compare the new ES6 spread operator with the traditional concat() method and unshift

Compare the new ES6 spread operator with the traditional concat() method and push

undefined vs typeof vs !!

Comparing performance of time

https://stackoverflow.com/questions/679915/how-do-i-test-for-an-empty-javascript-object