What is a non-local return?

Question

What is non local return? In what scenarios it is useful? Please give an example to explain.

Answer 1

Here's a good article on the use of non local returns in the context of ruby blocks.

Ruby’s blocks support non-local-return (some references), which means that a return from the block behaves identically to returning from the block’s original context.

It basically mean that you can call a block from a function, and the block has the ability to return from the original function.