Results for “Errors & optional values”
Small, practical examples. Search by task or narrow things down below.
Avoid a shared mutable default argument
Python: Create a fresh list inside the function when the optional argument is omitted.
Python✓ Tested
Build a JSON array from rows
Aggregate ordered text values into JSON.
json_group_array✓ Tested
Build a URL query string
Python: Use urlencode to percent-encode query parameter values correctly.
Python✓ Tested
Calculate a running total
Accumulate values in row order.
window✓ Tested
Calculate the number of calendar days between dates
C#: Subtract DayNumber values when the inputs are calendar dates.
C#✓ Tested
Calculate whole days between dates
Subtract Julian day values for date-only inputs.
julianday✓ Tested
Capture a command’s success-stream output
PowerShell: Assignment collects output values without requiring text redirection to a file.
PowerShell✓ Tested
Change an LED delay with a variable
Arduino / C: Assign a new value to a variable to change the next LED pulse duration.
Arduino / C✓ Tested
Check an external process exit status explicitly
PowerShell: LASTEXITCODE reports a native child exit code independently of ordinary PowerShell cmdlet errors.
PowerShell✓ Tested
Check an upper integer bound before adding
C++: For these nonnegative values, compare against the maximum minus the addend first.
C++✓ Tested
Collect repeated form field names
jQuery: serializeArray preserves multiple values as name-value records.
jQuery✓ Tested
Combine matching rows with INNER JOIN
Read product names with their matching stock values.
INNER JOIN✓ Tested