Maybe takes a function and checks for nothing.

maybe_decorator_recipe.js

/**
 * Do nothing when given nothing.
 */
const maybe = (fn) =>
  function (...args) {
    if (args.length === 0) {
      return;
    } else {
      for (let arg of args) {
        if (arg == null) {
          return;
        }
      }

      return fn.apply(this, args);
    }
  };

/**
 * Examples:
 */

maybe((a, b, c) => a + b + c)(1, 2, 3);
  //=> 6

maybe((a, b, c) => a + b + c)(1, null, 3);
  //=> undefined