Lookup of map vs object

You don't need to make add for loops in your test scenarios, the benchmark does it itself.

Compare the differing ways you can call a function with arbitrary arguments dynamically

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

Measure the performance of instanceOf operator vs comparing a basic string type.

Compare the new ES6 spread operator with the traditional concat() method, push, forEach, and for...of

Comparing performance of: lodash differenceBy with javascript reduce