JavaScript benchmark example

_setup.js

const arr = ['love', 'lovec', 'wlovec', 'asdlov123', 'abc123']
const word = 'love'

case1.js

for (const curWord of arr) {
  if (word.split('').every((letter) => curWord.includes(letter))) {
    console.log('1', curWord)
  }
}

case2.js

for (const curWord of arr) {
  let yes = true
  for (const letter of word) {
    if (!curWord.includes(letter)) {
      yes = false
      break
    }
  }
  if (yes) {
    console.log('2', curWord)
  }
}

case3.js

for (const curWord of arr) {
  let i
  for (i = 0; i < word.length; i++) {
    if (!curWord.includes(word.at(i))) {
      break
    }
  }
  if (i === word.length) {
    console.log('3', curWord)
  }
}

case4.js

for (let j = 0; j < arr.length; j++) {
  let i;
  for (i = 0; i < word.length; i++) {
    if (!arr[j].includes(word.at(i))) {
      break
    }
  }
  if (i === word.length) {
    console.log('4', arr[j])
  }
}

case5.js

loop1:
for (const curWord of arr) {
  for (const letter of word) {
    if (!curWord.includes(letter)) {
      break loop1
    }
  }
  console.log('5', curWord)
}

case6.js

loop1:
for (const curWord of arr) {
  for (let i = 0; i < word.length; i++) {
    if (!curWord.includes(word.at(i))) {
      break loop1
    }
  }
  console.log('6', curWord)
}

case7.js

loop1:
for (let j = 0; j < arr.length; j++) {
  for (let i = 0; i < word.length; i++) {
    if (!arr[j].includes(word.at(i))) {
      break loop1
    }
  }
  console.log('7', arr[j])
}

Test cases results

• case1: 88K ops/s ± 0.65% | 2.68 % slower
• case2: 86K ops/s ± 0.39% | 4.87 % slower
• case3: 86K ops/s ± 0.68% | 4.11 % slower
• case4: 90K ops/s ± 0.44% | Fastest
• case5: 83K ops/s ± 0.36% | 7.9 % slower
• case6: 84K ops/s ± 0.35% | 6.86 % slower
• case7: 90K ops/s ± 0.37% | Fastest

Conclusion

The lesser number of variables or functions, more faster our code will be.
Relying in simple structures like basic for and if is more performant.