Results for “Errors & optional values”
Small, practical examples. Search by task or narrow things down below.
Handle three possible outcomes
C: Check high, normal and low values with an ordered conditional chain.
C✓ Tested
Hello World: Blink
Arduino / C: Blink the built-in LED slowly and then quickly, repeating both rates in loop().
Arduino / C✓ Tested
Ignore small movements around a center value
Arduino / C: Values inside the deadband become zero while others keep their direction.
Arduino / C✓ Tested
Inspect deleted rows
Return values from the rows a DELETE removes.
DELETE✓ Tested
Iterate over object entries
Read JavaScript property names and values using Object.entries.
JavaScript✓ Tested
Join strings with a separator
Build a Java string from several values using String.join.
Java✓ Tested
Join strings with a separator
Use an output string stream to join C++ values without a trailing separator.
C++✓ Tested
Join text rows in a chosen order
Combine values using string_agg.
string_agg✓ Tested
Keep only the most recent items
Python: Use a bounded deque to discard the oldest item as new values arrive.
Python✓ Tested
Load service variables from an env file
Docker / Compose: env_file supplies runtime environment values.
Docker / Compose✓ Tested
Make a pair of columns unique together
SQL: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL✓ Tested
Make a pair of columns unique together
SQL Server: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL Server✓ Tested