Hooks

Hooks are functions that let you store state and perform side-effects.

reView comes with a few pre-defined Hooks. You can also create your own custom hooks.

Rules of hooks

• A hook function name always has to start with use_
• Hooks can only be used at the following locations:
  • Top level of a function / hook.
  • If condition inside a function / hook, given it's not already branched.
  • Match condition inside a function / hook, given it's not already branched.
  • Blocks inside a function / hook, given it's not already branched.
• Every render must call the hooks in the same order

All these rules are enforced by either compile time or run-time errors.

Pre-defined Hooks

reView comes with the following predefined Hooks:

• use_state
• use_effect