crappy-iteration.rb

str = 'this foo bar is fantastic i love foo'

words = []
str.split.each do |word|
  words << word if word =~ /foo|bar/
end
p words

words = str.split.inject [] do |words, word|
  words << word if word =~ /foo|bar/
  words
end
p words

words = str.split.map do |word|
  word if word =~ /foo|bar/
end.compact
p words

words = str.split.select do |word|
  word if word =~ /foo|bar/
end
p words

p str.split.grep(/foo|bar/)