[JS] Benchmarking functions

README.md

Usage:

test([
    () => expr1,
    () => expr2,
    // ...
    () => exprN
], <how many times execute>);

test.js

function test (ways, times) {
    ways.forEach((fn, k) => {
        let total = 0;
        for (let i = 0; i < times; i++) {
            const start = performance.now();
            fn();
            const end = performance.now();
            total += end - start;
        }

        console.log(k + ': ' + (total / times).toFixed(5) + 'ms');
    });
}