Go Recursion Functions
Go (Golang) Recursion Functions
Recursion in Go is a technique where a function calls itself to solve a problem by breaking it into smaller sub-problems.
1️⃣ What is Recursion?
A recursive function must have:
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Base case – stops recursion
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Recursive case – function calls itself
Without a base case, recursion will cause stack overflow.
2️⃣ Basic Recursion Example
Factorial of a Number
3️⃣ Recursive Function Flow (Factorial)
4️⃣ Recursion with Conditional Logic
Sum of First N Numbers
5️⃣ Fibonacci Series (Recursive)
⚠ This is inefficient for large n.
6️⃣ Recursion with Slice Processing
7️⃣ Recursive vs Iterative
| Feature | Recursion | Loop |
|---|---|---|
| Code | Clean & readable | Faster |
| Memory | Uses call stack | Less memory |
| Performance | Slower | Faster |
| Use Case | Trees, DFS | Simple iteration |
8️⃣ Tail Recursion (Concept)
Go does not optimize tail recursion, so loops are preferred.
9️⃣ Common Mistakes
❌ Missing base case
❌ Infinite recursion
❌ Large recursion depth
❌ Using recursion where loop is better
🔟 Best Practices
✔ Always define base condition
✔ Keep recursion depth small
✔ Prefer loops for large input
✔ Use recursion for trees & graphs
Summary
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Recursion = function calling itself
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Must have base case
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Useful for divide-and-conquer problems
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Be careful with performance
