Recursion

Recursion 👁️‍🗨️

Courtesy of @inside.code
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Wikipedia definition

Recursion in computer science is a method of solving a problem where the solution depends on solutions to smaller instances of the same problem (as opposed to iteration). The approach can be applied to many types of problems, and recursion is one of the central ideas of computer science.

Example

Let’s suppose we want to calculate n!, we know that n! = n (n — 1)!, and (n — 1)! = (n — 1) * (n-2)!, and we can continue like this until arriving to 0! which is 1, so we need what we call a base case to stop the recursion, otherwise the function would run endlessly

Example: sum of numbers from 1 to N

But the power of recursion doesn’t stop in these two examples, it can be used to solve more complex problems, we can use it for example in binary search or to find all subsequences of a string.

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