What is recursion in computer science?
In computer science, recursion refers to a technique where a function solves a problem by calling itself on a smaller input. It matters because the same idea reappears across many later topics, so building a clear mental picture of it early saves a lot of time.
How to approach it step by step
To work with recursion confidently, define the base case first, then express the general case in terms of it. LetMeTeach draws this out live on screen while explaining it aloud, so you watch each part appear instead of decoding a static block of text. You can interrupt at any point and ask for the same idea again in simpler words, in another language, or with a different example.
Worked example
Factorial of 5 unfolds as 5 × 4 × 3 × 2 × 1 = 120.
The mistake most learners make
Writing a recursive call with no reachable base case, causing infinite recursion.
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