Arrays & Tuples

Arrays

Annotate an array by appending [] to the element type:

const numbers: number[] = [1, 2, 3];
const names: string[] = ["Alice", "Bob"];

Or use the generic form Array<T>:

const flags: Array<boolean> = [true, false, true];

TypeScript will stop you from pushing the wrong type:

numbers.push("four"); // ❌ Error: Argument of type 'string' is not assignable to parameter of type 'number'

Common array methods

const scores = [90, 85, 78, 92];

const passing = scores.filter(s => s >= 80);   // number[]
const doubled = scores.map(s => s * 2);         // number[]
const total   = scores.reduce((a, b) => a + b, 0); // number

Tuples

A tuple is an array with a fixed length and known type at each position:

type Coordinate = [number, number];
const point: Coordinate = [10, 20];

const [x, y] = point; // destructuring

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Your task

1. Export a scores array of number[] containing at least three values.
2. Export a passing array that contains only scores greater than or equal to 80, derived from scores using .filter().
3. Export a range tuple typed as [number, number] representing the [min, max] of your scores.