TypeScript · Middle · Question 6 of 75

What does the conditional type `T extends string ? 'text' : 'other'` do?

✓Correct answer: Picks one of the types depending on whether T is assignable to string
2Checks at runtime whether the value is a string and throws an error
3Declares that T inherits from the built-in String class

Explanation

Conditional types are a type-level "ternary". Together with infer, they let you extract parts of types. Applied to a union, they distribute over each member (distributive conditional types).

What does the conditional type `T extends string ? 'text' : 'other'` do?

Explanation

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What does the conditional type T extends string ? 'text' : 'other' do?

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What does the conditional type `T extends string ? 'text' : 'other'` do?