Results for “required”
Small, practical examples. Search by task or narrow things down below.
Trim surrounding whitespace
Remove leading and trailing JavaScript string whitespace.
JavaScript✓ Tested
Validate a complete floating-point input
C: strtod exposes both the stopping position and range errors; reject nonfinite results when required.
C✓ Tested
Validate a structured text identifier
HTML: The pattern attribute matches the entire nonempty input; required handles the empty case.
HTML✓ Tested
Validate an email input
Use browser constraint validation for a required HTML email field.
HTML✓ Tested
Wait for multiple promises
Use Promise.all to collect JavaScript results in input order.
JavaScript✓ Tested
Write a JSON file
Save a dictionary as readable, indented JSON while preserving Unicode characters.
json✓ Tested
Write a text file
Save a string to a UTF-8 text file and close the file automatically when the write finishes.
file✓ Tested
Write a UTF-8 file
Use the built-in Node.js filesystem API to save text.
JavaScript✓ Tested
Write dictionaries to CSV
Write a list of dictionaries to a CSV file with a header row and a predictable column order.
csv✓ Tested