Tuples

Tuples are fixed-length arrays with specific types at each position.

Syntax

TYPESCRIPT

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let person: [string, number] = ["John", 30];
let record: [number, string, boolean] = [1, "active", true];

Tuple Types

TYPESCRIPT

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let person: [string, number] = ["Alice", 25];
console.log(person[0], person[1]);

function useState(initial: number): [number, (n: number) => void] {
    let value = initial;
    const setter = (n: number) => { value = n; };
    return [value, setter];
}

const [count, setCount] = useState(0);
console.log(count);

Try It Yourself

Practice

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Exercise

Practice this concept.

Answer

Write the code as shown above.

Quick Quiz

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What did you learn?

Concept A

Concept B

Concept C

Concept D

This covers the basics.

Retry Quiz

Interview Questions

Explain this concept.

It is a fundamental TypeScript feature.

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Array Types

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