String.trimLeft and trimRight in dart

Question

How to define trimLeft and trimRight functions for String? I can't find a simple solution to implement them.

My tricky solution is:

String _trimLeft(String str) {
  var s = (str + '.').trim();
  return s.substring(0, s.length-1);
}

String _trimRight(String str) {
  return ('.' + str).trim().substring(1);
}

Is there any 3rd-party libraries for Dart just like commons-lang to java, provides such basic functions?

Please star http://dartbug.com/5589 - It should just be there. — lrn, Mar 10 '14 at 10:26
possible duplicate of [Trimming whitespace in Dart strings from beginning or end](http://stackoverflow.com/questions/14107905/trimming-whitespace-in-dart-strings-from-beginning-or-end) — Günter Zöchbauer, Mar 14 '14 at 10:27

score 1 · Answer 1 · edited May 23 '17 at 12:20

Another approach would be to match against a RegExp, but your solution looks simpler.

String _trimLeft(String str) {
  RegExp re = new RegExp(r"^\s*(.+)");
  return re.firstMatch(str).group(1);
}

(This code is untested.)

Edit: This question was asked & answered before. see Trimming whitespace in Dart strings from beginning or end

Dart libraries are managed by pub and available on http://pub.dartlang.org/packages

score 1 · Accepted Answer · edited May 23 '17 at 12:03

1

See this answer that uses String.replace and a RegExp:

Trimming whitespace in Dart strings from beginning or end

I help maintain a general utility package called Quiver, but it doesn't have trim functions. They would be a great addition.

https://github.com/google/quiver-dart

edited May 23 '17 at 12:03

Community

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answered Mar 09 '14 at 07:55

Justin Fagnani

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String.trimLeft and trimRight in dart

2 Answers2