Why is My Recursive Function Returning Undefined in JavaScript?

Why is My Recursive Function Returning Undefined in JavaScript?

One common frustration when getting the hang of recursion is not understanding why your recursive function is returning undefined.

One common frustration when getting the hang of recursion is not understanding why your recursive function is returning undefined.

Often, this is because you’re not returning the next execution of your recursive function. I’ll show you what I mean.

Let’s say we’re writing a factorial function. Factorial is a mathematical operator where a number is multiplied by each lower number. For example, 4 factoral (written as 4!) is equivalent to 4 * 3 * 2 * 1 = 24.

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