remove_vowels_from_a_string_benchmark.ts

import { runBenchmarks, bench } from "https://deno.land/std/testing/bench.ts";

// 1119. Remove Vowels from a String
// https://leetcode.com/problems/remove-vowels-from-a-string/
function removeVowelsByLoop(S: string): string {
  let removed = "";

  for (const char of S) {
    switch (char) {
      case "a":
      case "e":
      case "i":
      case "o":
      case "u":
        break;
      default:
        removed += char;
    }
  }

  return removed;
}

function removeVowelsByRegex(S: string): string {
  return S.replace(/[aeiou]+/g, "");
}

const STRINGS = Array.from(new Array(100), () =>
  Array.from(new Array(100000), () =>
    String.fromCharCode(Math.floor(Math.random() * 26) + 97)
  ).join("")
);

bench({
  name: "loop",
  runs: 100,
  func(b): void {
    b.start();

    for (const string of STRINGS) {
      removeVowelsByLoop(string);
    }

    b.stop();
  }
});

bench({
  name: "regex",
  runs: 100,
  func(b): void {
    b.start();

    for (const string of STRINGS) {
      removeVowelsByRegex(string);
    }

    b.stop();
  }
});

runBenchmarks();