how do i loop through a string and get the number of occurrence of a character in ruby code example

Example 1: iterate over string ruby

a = 'hello, world'
a.each_char { |c|
  puts c
}

Example 2: ruby iterate over strings

input = 'abcdef' chars = input.split('')puts chars.lengthputs chars[2]puts  chars.each { |c|    puts c}