Once ensures that a function can only be called once.

once_combinator_recipe.js

/**
 * You pass it a function, and you get a function back.
 * That function will call your function once, and
 * thereafter will return undefined whenever it is
 * called.
 */
const once = (fn) => {
  let done = false;

  return function () {
    return done
      ? void 0
      : ((done = true), fn.apply(this, arguments));
  };
};

/**
 * Examples:
 */
const askedOnBlindDate = once(
  () => "sure, why not?"
);

askedOnBlindDate();
  //=> 'sure, why not?'

askedOnBlindDate();
  //=> undefined

askedOnBlindDate();
  //=> undefined