Declaring and Accessing Tuples

The syntax for creating a tuple is straightforward: you specify the types of each element in square brackets, in the exact order they should appear.

To declare a tuple, you use the format [Type1, Type2, Type3] where each type corresponds to a specific position:

let productInfo: [string, number] = ["Laptop", 999];
let coordinates: [number, number] = [10, 20];
let userRecord: [number, string, boolean] = [1, "Alice", true];

Accessing tuple elements works exactly like accessing array elements using index notation. TypeScript knows the exact type at each position, so you get full type safety:

let product: [string, number] = ["Phone", 599];
console.log(product[0]); // "Phone" (TypeScript knows this is a string)
console.log(product[1]); // 599 (TypeScript knows this is a number)

The key advantage is that TypeScript enforces both the correct type and the correct position. If you try to access product[0].toFixed(), TypeScript will catch the error because it knows the first element is a string, not a number.