onFunc (method)

onFunc

• onFunc<A>(...args): Opt<T>

• Apply (call) a function inside Some. Does nothing for None.

  Type Parameters

  • A extends any[]

  Parameters

  • Rest ...args: A

  Returns Opt<T>

  Unchanged Opt instance

  Example

  Both lines do the same thing

  opt(f).onSome(x => x())
  opt(f).onFunc()
  

  Example

  const g = (a: number, b: number): void => console.log(a, b);
  opt(g).onFunc(1, 2) // calls `g` (prints 1 and 2), returns Some(g)
  none.onFunc(79) // None
  

  Note

  onFunc is only available for functions, otherwise an exception will be thrown when called on Some.

  Imperative

  See

  Opt.apply for functional version