charCount method

int? charCount(String char)

Finds a specific's character occurence in a string.

Example

String foo = 'foo';
int occ = foo.charCount('o'); // returns 2

Implementation

int? charCount(String char) {
  if (this == null) return null;
  if (this!.isEmpty) return 0;
  return this!.split('').fold<int>(
        0,
        (previousValue, ch) => previousValue + (ch == char ? 1 : 0),
      );
}