Remove empty lines of a text document

Drop lines that are empty or whitespace only.

JavaScript Version 1.0.0 · MIT · .md

function removeEmptyLines(text) { return text.split(/\r?\n/).filter(line => line.trim() !== '').join('\n'); }

Input & expected output

"one\n\n  \ntwo"

"one\ntwo"

The edge case

""

""

Know the limits

• Line endings become LF.

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.