What is a JavaScript closure

Closures are closely related to functions, which is a dynamic environment in which the code of a function is running, and it is a concept of running time.

A closure is a function of a lexical representation that includes variables that do not have to be evaluated. That is, the function can use variables defined outside the function.

In the programming language, the so-called closure refers to a section where the grammatical domain is located in an area of a certain object and has the ability to continuously perform non-persistent variable values on the execution domain beyond its own scope. The non-persistent variables of these external execution domains magically preserve their values at the time the closure was originally defined (or created).

What is a JavaScript closure