Mastering JavaScript Functional Programming - Second Edition

A higher-order solution

If we don't want to modify the original function, we'll create a higher-order function, which we'll (inspiredly!) name once(). This function will receive a function as a parameter and will return a new function, which will work only a single time. (As we mentioned before, we'll be seeing more of higher-order functions in Chapter 6, Producing Functions – Higher-Order Functions; in particular, see the Doing things once, revisited section.)

Underscore and Lodash already have a similar function, invoked as _.once(). Ramda also provides R.once(), and most FP libraries include similar functionality, so you wouldn't have to program it on your own.

Our once() function may seem imposing at first, but as you get accustomed to ...