How Recursion works in JavaScript

The factorial of a non-negative number is the product of all positive numbers less than or equal to that number. For example, the factorial of 5 (written as 5!) is calculated as 5 * 4 * 3 * 2 * 1, which equals 120.

In other words, the factorial of the number 5 is 120.

The most important thing to understand about recursion is that you almost always need an explicit base case. This is the “until it doesn’t” part of the definition MPJ gives about recursion. Basically you need to tell it when to stop calling itself because it will max out on the call stack, which is kinda (but not really) like an infinite loop.

Note: You can still get a max call stack error even if you have a base case because the computation your giving it is too large to fit in the call stack.

In the example below the explicit base case is the conditional of when n is equal to 0, or when n is equal to 1.

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