Slice Text or List

Overloads can return different types based on input. Here, slicing a string should return a string. Slicing a string array should return a string array.

Write the overloads first, then one body using Array.isArray and the built-in slice method. Handle the optional end index.

function head(xs: string[]) {
  return xs.slice(0, 1);
}

Your Task

Create a sliceEither that slices strings or string arrays.

• Overloads:
• sliceEither(input: string, start: number, end?: number): string
• sliceEither(input: string[], start: number, end?: number): string[]
• Implement once with a union parameter and a small check.
• Do not mutate the original value.