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fix(rules-of-react): "everytime" -> "every time" (#6737)
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SiarheiBobryk committed Apr 6, 2024
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One of the key concepts that makes React, _React_ is _purity_. A pure component or hook is one that is:

* **Idempotent** – You [always get the same result everytime](/learn/keeping-components-pure#purity-components-as-formulas) you run it with the same inputs – props, state, context for component inputs; and arguments for hook inputs.
* **Idempotent** – You [always get the same result every time](/learn/keeping-components-pure#purity-components-as-formulas) you run it with the same inputs – props, state, context for component inputs; and arguments for hook inputs.
* **Has no side effects in render** – Code with side effects should run [**separately from rendering**](#how-does-react-run-your-code). For example as an [event handler](/learn/responding-to-events) – where the user interacts with the UI and causes it to update; or as an [Effect](/reference/react/useEffect) – which runs after render.
* **Does not mutate non-local values**: Components and Hooks should [never modify values that aren't created locally](#mutation) in render.

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## Components and Hooks must be idempotent {/*components-and-hooks-must-be-idempotent*/}

Components must always return the same output with respect to their inputs – props, state, and context. This is known as _idempotency_. [Idempotency](https://en.wikipedia.org/wiki/Idempotence) is a term popularized in functional programming. It refers to the idea that you [always get the same result everytime](learn/keeping-components-pure) you run that piece of code with the same inputs.
Components must always return the same output with respect to their inputs – props, state, and context. This is known as _idempotency_. [Idempotency](https://en.wikipedia.org/wiki/Idempotence) is a term popularized in functional programming. It refers to the idea that you [always get the same result every time](learn/keeping-components-pure) you run that piece of code with the same inputs.

This means that _all_ code that runs [during render](#how-does-react-run-your-code) must also be idempotent in order for this rule to hold. For example, this line of code is not idempotent (and therefore, neither is the component):

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