@studnicky/v8/array-splice-outside-loops

Disallows .splice() calls inside any loop body (for, while, do...while, for...of, for...in). Array.splice is O(n) per call because it shifts every trailing element; calling it every iteration makes the loop O(n²). Build a new array and swap it in once, or filter out-of-place instead of mutating in a loop.

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

✗ Incorrect

for (let i = items.length - 1; i >= 0; i--) {
  if (!items[i].active) { items.splice(i, 1); }
}

for (const id of staleIds) {
  const index = records.findIndex((r) => r.id === id);
  records.splice(index, 1);
}

✓ Correct

items = items.filter((item) => item.active);

const staleSet = new Set(staleIds);
records = records.filter((r) => !staleSet.has(r.id));