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Fixed-length typed arrays
Tuples are arrays with fixed length and types at each position:
let point: [number, number] = [10, 20];
let entry: [string, number] = ["age", 25];
const [x, y] = point; // x and y are numbers
point = [1, 2, 3]; // Error: too many elements
Tuples are useful for returning multiple values from functions.