reduceのいろんな使い方

reduce.rb

# require "pry"

puts [1, 2, 3].inspect
result_1 = [1, 2, 3].reduce do |sum, n|
  sum + n
end

puts result_1.inspect

puts

puts [14, 15, 16].inspect
result_2 = [14, 15, 16].reduce(100) do |acc, n|
  acc += (n + 10)
  acc
end

params = "jalan:1,rakuten:2,travelbook:3".split(",")

result_3 = params.reduce([]) do |acc, param|
  spot = param.split(":")

  # spot[0], spot[1]

  provider, key = param.split(":")

  # binding.pry

  acc << param
end

puts result.inspect

result_4 = ["mary", "john", "joseph"].reduce("   ") do |acc, str|
  # binding.pry
  acc += (" " + str) 
  # binding.pry
  acc
end

puts result_4.inspect