@studnicky/v8/for-of-arrays

Disallows for...of over arrays or tuples. When type services are available the rule uses the TypeScript checker to confirm the iterated value is an array type. Without type services, only literal array expressions are flagged. Use a counted for loop for arrays — index access on typed arrays is faster than the iterator protocol.

Fixable: No · Options: No · Suggested severity: error

✗ Incorrect

for (const item of arr) {
  process(item);
}

for (const item of [1, 2, 3]) {
  total += item;
}

✓ Correct

for (let i = 0; i < arr.length; i++) {
  const item = arr[i];
  if (item !== undefined) { process(item); }
}

// for...of over non-array iterables (Set, Map, generator) is fine
for (const [key, value] of map) {
  register(key, value);
}