Nested Loops Aren’t the Problem. This Is.
ArjanCodes
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Nested loops are often treated as an algorithm problem. But most of the time, they’re a design problem.
In this video, I break down a real example and show why nested loops usually appear: wrong data structures, misplaced behavior, and too many responsibilities in one place. Then we refactor the code step by step into something simpler and easier to understand.
???? GitHub Repository: https://git.arjan.codes/2026/nested.
???? ArjanCodes Courses: https://www.arjancodes.com/courses.
???? Join my Discord server: https://discord.arjan.codes.
⌨️ Keyboard I’m using: https://amzn.to/49YM97v.
???? Chapters:
0:00 Intro
1:09 Symptom 1: Wrong Data Structure (Implicit Join)
4:33 Symptom 2: Behavior in the Wrong Place
6:54 Symptom 3: Too Many Responsibilities
12:45 Other Reasons Nested Loops Appear
14:13 Final Thoughts
#arjancodes #softwaredesign #python
Nested loops are often treated as an algorithm problem. But most of the time, they’re a design problem.
In this video, I break down a real example and show why nested loops usually appear: wrong data structures, misplaced behavior, and too many responsibilities in one place. Then we refactor the code step by step into something simpler and easier to understand.
???? GitHub Repository: https://git.arjan.codes/2026/nested.
???? ArjanCodes Courses: https://www.arjancodes.com/courses.
???? Join my Discord server: https://discord.arjan.codes.
⌨️ Keyboard I’m using: https://amzn.to/49YM97v.
???? Chapters:
0:00 Intro
1:09 Symptom 1: Wrong Data Structure (Implicit Join)
4:33 Symptom 2: Behavior in the Wrong Place
6:54 Symptom 3: Too Many Responsibilities
12:45 Other Reasons Nested Loops Appear
14:13 Final Thoughts
#arjancodes #softwaredesign #python
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