Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


Ruby Loops: When and When not to put "do"

I recently was working with loops in Ruby and I've tested my code on online compilers and I've noticed that when doing an Until loop, the loop can function correctly with or without the keyword do next to it. Why is that so? Is the do keyword necessary? Can I leave do out? If I leave the keyword out is it considered bad practice?

1 Answer

J Scott Erickson
J Scott Erickson
11,883 Points

In my experience programming ruby in professional settings most people use the do keyword, and is some cases it is necessary such as

["some","stuff","in","here"].each do |x|
  puts "#{x}"