Just to clarify here: Both lambdas and procs are Proc objects. Blocks gets turned into Proc objects when you take their value.

So just be clear about whether you're talking about a proc or a Proc...

> In a block or Proc, it returns from the calling method

No, in block or a Proc it returns from the scope where it was defined.

Usually this is the same, and so it doesn't usually matter much, but if you pass a proc or a block down to another method, then a return within the block will still return from the method where it was defined.

This can occasionally be useful, as you can use it to pass in a predicate to a method that can control if/when you want to return, irrespective of how deeply nested.

Too late to edit now, and this is what I get for quibbling about casing:

> No, in block or a Proc it returns from the scope where it was defined.

Should of course read:

> No, in a block or a proc it returns from the scope where it was defined.