Test on isEqual performance

Benchmark description

Measure the performance of delete versus removing a prop from an object without mutating

appendChild vs replaceWith, DocumentFragment vs not DocumentFragment

appendChild vs replaceWith, DocumentFragment vs not DocumentFragment

performance comparison of ways to find if an array contains a value

Based on https://stackoverflow.com/questions/39510821/how-to-remove-all-element-from-array-except-the-first-one-in-javascript. All results should output "a" in the console using console.log(arr).

Abc