A closure is a function in JavaScript that refers to variables in the outer scope from its inner scope. The outer scope is kept inside the inner scope by the closure. To comprehend the closures, you must first comprehend how lexical scoping works.
Closure, also known as lexical closure or function closure in programming languages, is a method of implementing lexically scoped name binding in a language having first-class functions. A closure is an operational record that stores a function and its surroundings.
A JavaScript closure is what it's called. It enables the use of "private" variables in a function. The anonymous function's scope protects the counter, which can only be modified via the add function. A closure is a function that has access to the parent function's scope even after it has closed.
Closures are the key mechanism for ensuring data privacy in JavaScript. The contained variables are only in scope within the containing (outer) function when you utilize closures for data privacy. Only the object's privileged methods provide access to the data from outside scope.
Closures in javascript have the virtue of allowing you to bind a variable to an execution context. var closedIn = ; var f = function() closedIn. blah = 'blah'; / closedIn was just "closed in" because it was defined outside of the function.
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