trim abstract method
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:
final trimmed = '\tDart is fun\n'.trim(); print(trimmed); // 'Dart is fun'
Otherwise, the original string itself is returned:
const string1 = 'Dart'; final string2 = string1.trim(); // 'Dart' print(identical(string1, string2)); // 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 according to Unicode version 6.3:
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 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
Some later versions of Unicode do not include U+0085 as a whitespace character. Whether it is trimmed depends on the Unicode version used by the system.