TypeScript · Junior · Question 24 of 75

How do you specify the state type if the initial value is `null`: `useState(null)`?

✓Correct answer: useState<User | null>(null)
2useState(null as User)
3No need to specify it; TS infers User

Explanation

Without a generic, the type is inferred as null, and you won't be able to assign a user later. An explicit generic describes all possible states. The cast null as User lies to the compiler: the code will then assume a user always exists.

How do you specify the state type if the initial value is `null`: `useState(null)`?

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How do you specify the state type if the initial value is null: useState(null)?

Explanation

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Test yourself

How do you specify the state type if the initial value is `null`: `useState(null)`?