how to write a reduce function in ruby code example

Example 1: ruby reduce

# Sum some numbers
(5..10).reduce(:+)                             #=> 45
# Same using a block and inject
(5..10).inject { |sum, n| sum + n }            #=> 45
# Multiply some numbers
(5..10).reduce(1, :*)                          #=> 151200
# Same using a block
(5..10).inject(1) { |product, n| product * n } #=> 151200
# find the longest word
longest = %w{ cat sheep bear }.inject do |memo, word|
   memo.length > word.length ? memo : word
end
longest                                        #=> "sheep"

Example 2: reduce ruby baud rate

class AsyncWorker
  def initialize(&blk)
    @blk = Thread.new(&blk)
  end

  def call
    @blk.join
    @blk.value
  end
end