for vs each

for-vs-each

results = [ ]

for i in 1..3
  results << lambda { i }
end

puts results.map { |l| l.call }



results = [ ]

(1..3).each do |i|
   results << lambda { i }
end

puts results.map { |l| l.call }


list = %w{ google yahoo bing duckduckgo }
 
for engine in list
  # do something with engine
end

puts engine  # duckduckgo



list = %w{ google yahoo bing duckduckgo }
 
list.each do |engine|
  # do something with engine
end
puts engine # NameError: undefined local variable or method ‘engine’