r/ProgrammerTIL
40k members
r/ProgrammerTIL is a subreddit with 40k members. The most common kinds of discussions are advice requests and solution requests, and the community frequently discusses til, programming, python, code, and software.
Learn something new? Wanna share? Post here along with the language/framework you learned it in.
This is a great place for novice and advanced programmers alike to come and discover all the interesting things they could learn *tomorrow* ;)
Popular Themes in r/ProgrammerTIL
#1
Advice Requests
: "How to prevent your Git repo from being cloned on Windows :)"
8 posts
#2
Solution Requests
: "what is the best way to learn new language without tutorial hell?"
3 posts
#3
Opportunities
: "Build a Netflix API Miner With Python"
3 posts
#4
Self-Promotion
: "TIL: URLs support emoji (sorta), so I built an emoji-only URL shortener"
3 posts
#5
Pain & Anger
: "TIL that ACK means ACKnowledgement (I have some problem with acronyms so I made a full list)"
2 posts
#6
Money Talk
: "Spent 3 days finding out reason for Spotbugs error..."
1 post
Popular Topics in r/ProgrammerTIL
#1
Til
: "Til ASCII is designed in such a way that you can xor an uppercase letter with a space to get its lowercase counterpart and vice versa. And you can xor any numeric character with '0' to get its integer value."
60 posts
#2
Programming
: "[C#] Today I learned that attempting to create a file with a path string equal to a directory path literally creates an empty file"
38 posts
#3
Python
: "TIL that Python contains a XKCD Easter egg when you "import antigravity" it takes you to the comic"
21 posts
#4
Code
: "please help me run a Code"
16 posts
#5
Software
: "Enhancing Software Testing Methodologies - Guide"
16 posts
#6
Git
: "[Git] TIL about Git worktrees"
10 posts
#7
Ai
: "An interview with the Forbes Ai writer, Tom Taulli"
10 posts
#8
Javascript
: "[Javascript] TIL that Javascript has weird rules surrounding comparisons between numbers and strings because that's what QA testers wanted during that time."
9 posts
#9
Coding
: "Poor mans debug repl with imports [NodeJS][Typescript]"
9 posts
#10
C#
: "[C#] Today I learned that attempting to create a file with a path string equal to a directory path literally creates an empty file"
8 posts
Flair Used in r/ProgrammerTIL
#1
Other
: "TIL ASCII is designed in such a way that you can xor an uppercase letter with a space to get its lowercase counterpart and vice versa. And you can xor any numeric character with '0' to get its integer value."
98 posts
#2
Other Language
: "[General] TIL you can replace '.com' in a github repo or PR URL with '.dev' to open it in github.dev, a VS Code environment running in your browser"
16 posts
#3
Python
: "TIL that Python contains a XKCD Easter egg when you "import antigravity" it takes you to the comic"
14 posts
#4
Javascript
: "[Javascript] TIL that Javascript has weird rules surrounding comparisons between numbers and strings because that's what QA testers wanted during that time."
10 posts
#5
Java
: "TIL: There's a new paradigm called AOP (Aspect Oriented Programming) where you can treat things like function entry/return as events and write code in a separate place for such events"
5 posts
#6
Ruby
: "Optimistic Locking in Ruby on Rails"
3 posts
#7
Bash
: "TIL how to do grep on ps output without seeing grep itself"
2 posts
#8
C#
: "[.NET 4.0] TIL that there are BigIntegers, which can store numbers that are extremely large"
2 posts
#9
Linux
: "Command Line Reference"
2 posts
#10
SQL
: "Where nullable column not equals"
2 posts
Member Growth in r/ProgrammerTIL
Yearly
+1k members(3.6%)
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Last updated: June 14, 2026