Arrays & Tuples

const scores: number[] = [72, 88, 95]; const names: Array<string> = ["Ana", "Ben"]; // same thing, generic syntax

scores.push("A+"); // error: string is not assignable to number

Array methods keep their types: scores.map(s => s / 100) is number[], names.filter(n => n.startsWith("A")) is string[]. TypeScript infers the element type from the initial values.