A LocalJumpError in Ruby typically occurs under specific circumstances related to block and proc usage, particularly when there's an attempt to return from a context where it's not supported. Here are the primary scenarios where you might encounter a LocalJumpError:
Returning from a Block: In Ruby, blocks are not objects themselves but can be converted into objects of class Proc. If you attempt to return from a block that is not attached to any method or proc, Ruby will raise a LocalJumpError. This is because the return statement attempts to exit a method context that does not exist[1][4][5].
Using Proc.new or proc Outside of a Method: When you use Proc.new or proc to create a new Proc object and include a return statement within this proc, attempting to call this proc outside of any method will result in a LocalJumpError. This happens because the return attempts to exit a method that isn't there[4][5][6].
Improper Use of break in Procs: Using break inside a proc that is not within a loop or an iterator will also lead to a LocalJumpError. This is because break is designed to exit loops or block iterations, and using it outside these contexts means there's nothing to break out from[6].
Yielding Without a Block: If a method attempts to yield to a block that hasn't been provided, Ruby raises a LocalJumpError. ...
