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How do closures capture variables in JavaScript functions?

Asked on Mar 26, 2026

Answer

Closures in JavaScript allow a function to capture and remember its lexical environment, even after the function has finished executing. This means a function can access variables from its outer scope even after that scope has closed.
// Example of a closure capturing a variable
        function outerFunction(outerVariable) {
            return function innerFunction(innerVariable) {
                console.log("Outer Variable: " + outerVariable);
                console.log("Inner Variable: " + innerVariable);
            };
        }

        const newFunction = outerFunction("outside");
        newFunction("inside");
        // Output:
        // Outer Variable: outside
        // Inner Variable: inside
Additional Comment:
  • The "outerFunction" creates a closure by returning the "innerFunction".
  • The "innerFunction" captures the "outerVariable" from its lexical scope.
  • When "newFunction" is called, it still has access to "outerVariable" even though "outerFunction" has finished executing.
  • Closures are useful for data encapsulation and creating private variables.
✅ Answered with JavaScript best practices.
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