Function complement

Returns the complement of a function.

  • If the result of the function is truthy, the result of the complement is falsy.
  • If the result of the function is falsy, the result of the complement is truthy.

Example

const a = (x: number) => x > 0;
const b = complement(a);
console.log(a(1)); // true
console.log(b(1)); // false
  • complement<Fn extends AnyFn>(fn: Fn): (...args: Parameters<Fn>) => boolean

    Type Parameters

    • Fn extends AnyFn

      The type of the function.

    Parameters

    • fn: Fn

      The function.

    Returns (...args: Parameters<Fn>) => boolean

    A function whose result is the negation of the result of fn.