Module function/once

once

• once<F>(fn: F): F

• Accepts a function fn and returns a function that guards invocation of fn such that fn can only ever be called once, no matter how many times the returned function is invoked. The first value calculated is returned in subsequent invocations.

  example

   var addOneOnce = once(x => x + 1);
   addOneOnce(10); //=> 11
   addOneOnce(addOneOnce(50)); //=> 11
  

  Type parameters

  • F: Func<any>

  Parameters

  • fn: F

    The function to wrap in a call-only-once wrapper.

  Returns F

  The wrapped function.