What is the exact definition of a closure?

Question

I\'ve read through previous topics on closures on stackflow and other sources and one thing is still confusing me. From what I\'ve been able to piece together technically a

Answer 1

I think Peter Eddy has it right, but the example could be made more interesting. You could define two functions which close over a local variable, increment & decrement. The counter would be shared between that pair of functions, and unique to them. If you define a new pair of increment/decrement functions, they would be sharing a different counter.

Also, you don't need to pass in that initial value of x, you could let it default to zero inside the function block. That would make it clearer that it's using a value which you no longer have normal access to otherwise.