One of the ways to change state is with actions. Every action is regular class method that has been decorated with `@action` decorator. It must return state changes to modify state.
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```js
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@action
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rename() {
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return {
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name: 'Steve'
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}
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}
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```
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State is always immutable. Do not mutate it without returning state change in action. DOM will not be re-rendered that way.