altOpt (method)

altOpt

• altOpt(def): OptSafe<T>

• Return this for Some, def wrapped in opt for None.

  Parameters

  • def: EmptyValue | T

  Returns OptSafe<T>

  Example

  const inputNull: number | null = null as number | null;
  opt(inputNull).altOpt(null) // None
  opt(inputNull).altOpt(1) // Some(1)
  opt(2).altOpt(1) // Some(2)
  

  Example

  type Handler = (_: number) => void;
  const userHandler: Handler | null = a => console.log('user handling', a);
  const systemHandler: Handler | null = a => console.log('system handling', a);
  const backupHandler: Handler | null = a => console.log('backup handling', a);
  const panicHandler: Handler = a => console.log('PANIC handling', a);
  const handler =
    opt(userHandler)
      .altOpt(systemHandler)
      .altOpt(backupHandler)
      .orElse(panicHandler);
  handler(250 + 64); // prints "user handling 314"