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TypeScript Generics and Advanced Types Cheatsheet: Master Complex Type Systems

Cheatsheet August 20, 2024
typescript 

function getFirstElement<T>(arr: T[]): T {
  return arr[0];
}

const firstNumber = getFirstElement([1, 2, 3]); // number
const firstString = getFirstElement(['a', 'b', 'c']); // string

This function works with any array type and returns the first element, maintaining the type of the elements.

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