If I wanted to do something like this:
collection.each do |i|
return nil if i == 3
..many lines of code here..
end
How would I get that effect? I know I could just wrap everything inside the block in a big if statement, but I'd like to avoid the nesting if possible.
Break would not work here, because I do not want to stop iteration of the remaining elements.
next
inside a block returns from the block. break
inside a block returns from the function that yielded to the block. For each
this means that break
exits the loop and next
jumps to the next iteration of the loop (thus the names). You can return values with next value
and break value
.
#!/usr/bin/ruby
collection = [1, 2, 3, 4, 5 ]
stopped_at = collection.each do |i|
break i if i == 3
puts "Processed #{i}"
end
puts "Stopped at and did not process #{stopped_at}"
In this instance, you can use break to terminate the loop early:
collection.each do |i|
break if i == 3
...many lines
end
...of course, this is assuming that you're not actually looking to return a value, just break out of the block.
break
in Ruby — break 5
will cause each
to return 5.
Success story sharing
break value
didn't work for me, whilenext value
worked fine. Thanks a lot.next
andbreak
are in no way specific to looping constructs, so the article you linked is very misleading (since it heavily implies the opposite). And my descriptions are definitely correct whennext
andbreak
are used inside blocks (note thatwhile
andfor
are rarely, if ever, used in Ruby so 99% of uses ofnext
andbreak
are within blocks).