Quiz · 3 questions
📐 Arrays & Tuples — Where Position Matters
T[], Array<T>, tuples, readonly modifiers, as const, variadic tuples
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Quiz
01What's the difference between
string[] and [string, string]?Hint
Hover both:
const a: string[] = ['hi'] and const b: [string, string] = ['hi', 'there']. The shapes are different.02What does
as const do to an array literal?Hint
Try both and hover:
const colors = ['red', 'blue'] vs const colors = ['red', 'blue'] as const. The inferred types are very different.03What problem do variadic tuples solve?
Hint
Variadic tuples are the reason RxJS, Redux Toolkit, and the modern TypeScript-aware versions of util libraries finally have proper types for compose/pipe.
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