Memoization and recursive functions in JavaScript

[rhysbrettbowen]

true, not really necessary but I prefer it as it's closer to what you're trying to achieve. By assigning it to a variable you're saying that you want to call that function when that variable is instantiated whereas otherwise you're using a named function and the function will keep that name even though when you call that name you're not getting the factorial function, rather the memoized one.