Custom string iterators

Methods
E
Instance Public methods
each_char()

Yields a single-character string for each character in the string. When $KCODE = ‘UTF8’, multi-byte characters are yielded appropriately.

Source: show 

# File rails/activesupport/lib/active_support/core_ext/string/iterators.rb, line 10
def each_char
  scanner, char = StringScanner.new(self), %r./u
  loop { yield(scanner.scan(char) || break) }
end