Reduce Inject

reduce and inject accumulate collection values into one result.

reduce_inject.rb

starting_total = 
scores = [3, 4, 5]

total = scores.reduce(starting_total) do |sum, score|
  sum + score
end

puts "starting_total=#{starting_total}"
puts "scores=#{scores.join(",")}"
puts "total=#{total}"

starting_total = 
scores = [3, 4, 5]

total = scores.reduce(starting_total) do |sum, score|
  sum + score
end

puts "starting_total=#{starting_total}"
puts "scores=#{scores.join(",")}"
puts "total=#{total}"

starting_total = 
scores = [3, 4, 5]

total = scores.reduce(starting_total) do |sum, score|
  sum + score
end

puts "starting_total=#{starting_total}"
puts "scores=#{scores.join(",")}"
puts "total=#{total}"

reduce `reduce` passes the accumulated value and the next item to the block each step.