React useCallback

Goal

Use useCallback only for needed function identity stability. Do not add it by default.

Rules

• Use with memo() children when callback identity matters.
• Wrap functions returned from custom hooks.
• Prefer moving effect-only functions inside the effect.
• Use updater functions to remove state dependencies.
• Keep dependency arrays complete.
• Do not use inside loops.
• Do not use when the child is not memoized.
• Do not use for simple interactions without evidence.

Good Uses