Class AsyncOnceSealed

do

• do(f: AsyncVoidCallback): false | Promise<boolean>

• calls the function f if and only if Do is being called for the first time for this instance of Once.

  Remarks

  In other words, given var once = new Once(), if once.do(f) is called multiple times, only the first call will invoke f, even if f has a different value in each invocation.

  Parameters

  • f: AsyncVoidCallback

  Returns false | Promise<boolean>