Variable scope within a block in ruby

Question

I'm struggling with variable scope within a block in ruby. I learnt that do..end that follows while, until, or for loops are not blocks because while, until, or for are not method calls. So they don't create their own inner scope. but this example confused me

loop do
  b = 2
  p b # => 2
  break
end
p b

Here in this example b is initialized with the number 2 inside the do..end. The puts method is called with the variable b passed to it as an argument, and it through an NameError. saying that b is undefined local variable, but as i said before the do..end that follows while, until, or for loops don't create their own inner scope

As you mentioned while, until, and for are keywords and do not create a local variable scope. loop on the other hand is a method call implemented as Kernel#loop and it adheres to the same lexical block scoping as other block calls in ruby. — engineersmnky
– engineersmnky, Commented Dec 14, 2021 at 16:22

Jörg W Mittag · Accepted Answer · 2021-12-14 19:54:56Z

1

but as i said before the do..end that follows while, until, or for loops don't create their own inner scope

Exactly. But there is no while, until, or for loop in your code.

answered Dec 14, 2021 at 19:54

Jörg W Mittag

371k79 gold badges457 silver badges666 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Variable scope within a block in ruby

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related