JS: String.prototype.trim

By Xah Lee. Date: .

s.trim()

Returns a new string with begin/end whitespaces removed

The whitespaces removed are:

Code PointNameAbbreviation
U+0009CHARACTER TABULATION<TAB>
U+000BLINE TABULATION<VT>
U+000CFORM FEED (FF)<FF>
U+0020SPACE<SP>
U+00A0NO-BREAK SPACE<NBSP>
U+FEFFZERO WIDTH NO-BREAK SPACE<ZWNBSP>
Other category “Zs”Any other Unicode “Separator, space” code point<USP>
U+000ALINE FEED (LF)<LF>
U+000DCARRIAGE RETURN (CR)<CR>
U+2028LINE SEPARATOR<LS>
U+2029PARAGRAPH SEPARATOR<PS>

[see JS: Whitespace Characters]

console.log ( "   ab\n".trim () === "ab" ); // true

Reference

ECMAScript 2015 §Text Processing#sec-string.prototype.trim

String Topic

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  2. JS: String Code Unit vs Code Point
  3. JS: Unicode Character Escape Sequence
  4. JS: Allowed Characters in Identifier
  5. HTML: Allowed Characters in id Attribute
  6. HTML: Character Sets and Encoding
  7. HTML/XML Entity List

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  5. JS: JSON

  1. JS: String Object
  2. JS: String.prototype
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