ltrim function

String ltrim(String str, [ String? chars ])

Removes the given chars from the start of the string.

If chars is null, leading whitespace is removed.

Example:

ltrim('  hello'); // 'hello'
ltrim('xxhello', 'x'); // 'hello'

Implementation

String ltrim(String str, [String? chars]) {
  if (chars == null) return str.trimLeft();
  final set = chars.split('').toSet();
  var start = 0;
  while (start < str.length && set.contains(str[start])) {
    start++;
  }
  return str.substring(start);
}