Sort lines of a text document in alphabetical order

Split into lines and sort them by UTF-16 code units.

JavaScript Version 1.0.0 · MIT · .md

function sortLines(text) { return text.split(/\r?\n/).sort().join('\n'); }

Input & expected output

"delivered\nbounced\naccepted"

"accepted\nbounced\ndelivered"

The edge case

"b\nB\na"

"B\na\nb"

Know the limits

• Default sort order puts uppercase before lowercase, as the edge case shows. Use localeCompare for human ordering.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.