What exactly does closure refer to in JavaScript? function delay_message(msg) { setTimeout(function closure() { alert(msg); }, 1000); } In this case, the above function closure is defined within the body of delay_message, but the function definition -- as well as the parent function's variable msg-- outlive the scope of the delay_message function call
What is the difference between a closure and a lambda? And a closure, quoting Scott's Programming Language Pragmatics is explained as: … creating an explicit representation of a referencing environment (generally the one in which the subroutine would execute if called at the present time) and bundling it together with a reference to the subroutine … is referred to as a closure
c# - When to use closure? - Stack Overflow The closure implicitly carries its environment with it; you seamlessly refer to that environment from inside the executing part (the lambda) Without closures you must make that environment explicit That should explain to you when you would use closures: all the time Most instances where a class is instantiated to carry with it some state
sql - What is a database closure? - Stack Overflow Closure(X, F) 1 INITIALIZE V:= X 2 WHILE there is a Y -> Z in F such that: - Y is contained in V and - Z is not contained in V 3 DO add Z to V 4 RETURN V It can be shown that the two definition coincide A database closure might refer to the closure of all of the database attributes