Returns the string without any leading and trailing whitespace.
If the string contains leading or trailing whitespace, a new string with no leading and no trailing whitespace is returned:
'\tDart is fun\n'.trim(); // 'Dart is fun'
Otherwise, the original string itself is returned:
var str1 = 'Dart';
var str2 = str1.trim();
identical(str1, str2); // true
Whitespace is defined by the Unicode White_Space property (as defined in version 6.2 or later) and the BOM character, 0xFEFF.
Here is the list of trimmed characters (following version 6.2):
0009..000D ; White_Space # Cc <control-0009>..<control-000D>
0020 ; White_Space # Zs SPACE
0085 ; White_Space # Cc <control-0085>
00A0 ; White_Space # Zs NO-BREAK SPACE
1680 ; White_Space # Zs OGHAM SPACE MARK
180E ; White_Space # Zs MONGOLIAN VOWEL SEPARATOR
2000..200A ; White_Space # Zs EN QUAD..HAIR SPACE
2028 ; White_Space # Zl LINE SEPARATOR
2029 ; White_Space # Zp PARAGRAPH SEPARATOR
202F ; White_Space # Zs NARROW NO-BREAK SPACE
205F ; White_Space # Zs MEDIUM MATHEMATICAL SPACE
3000 ; White_Space # Zs IDEOGRAPHIC SPACE
FEFF ; BOM ZERO WIDTH NO_BREAK SPACE
Source
String trim();