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TypeScript Generics and Advanced Types Cheatsheet: Master Complex Type Systems

Cheatsheet August 20, 2024
typescript

function createArray<T = string>(length: number, value: T): T[] {
  return Array(length).fill(value);
}

const stringArray = createArray(3, 'x'); // string[]
const numberArray = createArray<number>(3, 42); // number[]

If no type is provided, T defaults to string.