generics.ts

const randomElement = <T>(xs: T[]): T => {
  const randomIndex = Math.floor(Math.random() * xs.length)
  return xs[randomIndex]
}

// Example usage
const a = randomElement(['a', 'b', 'c'])  
  
//The values in the array don't have to be the same type. Typescript can infer.  
const b = randomElement([1, '2', 3, 4, {id: '1', foo: 'bar'}])


  
// using two different generic types
const randomElement2 = <T, U>(xs: T[], ys: U[]): T | U => {
  const randomIndex = Math.floor(Math.random() * xs.length)
  const useX = Math.random() < 0.5
  return useX ? xs[randomIndex] : ys[randomIndex]
}
     
// Example usage
const c = randomElement2(['a', 'b', 'c'], [1, 2, 3])  )