The snippet library.
Small, practical examples. Search by task or narrow things down below.
Keep exec-form arguments literal
Docker / Compose: JSON exec form does not expand shell environment variables.
Docker / Compose✓ Tested
Keep fixed text in flash memory
Arduino / C: Keep fixed text in flash memory on an Uno with the Serial Monitor set to 9600 baud.
Arduino / C✓ Tested
Keep function state between calls
C: A static local variable retains its stored value for the lifetime of the process.
C✓ Tested
Keep function-local assignments separate from caller state
PowerShell: Ordinary function assignments create local variables rather than replacing the caller’s variable.
PowerShell✓ Tested
Keep loop state by avoiding a pipeline subshell
Bash Scripts: Redirect input into a while loop so updates to a counter remain in the current shell.
Bash Scripts✓ Tested
Keep numeric input text until conversion
Keep numeric input text until conversion with a small React component and explicit browser behavior.
React✓ Tested
Keep only the latest requested result
Keep only the latest requested result with a small React component and explicit browser behavior.
React✓ Tested
Keep only the most recent items
Python: Use a bounded deque to discard the oldest item as new values arrive.
Python✓ Tested
Keep only values satisfying a condition
Keep only values satisfying a condition in a complete Rust program using the standard library.
Rust✓ Tested
Keep parent rows while filtering joined children
SQL: Put a child filter in ON when unmatched parents must remain in the result.
SQL✓ Tested
Keep parent rows while filtering joined children
SQL Server: Put a child filter in ON when unmatched parents must remain in the result.
SQL Server✓ Tested
Keep parent rows while filtering joined children
Postgres: Put a child filter in ON when unmatched parents must remain in the result.
Postgres✓ Tested