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Please explain what a closure is and provide a simple real-world example of using a closure.

分类: technical

难度: easy

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答题技巧

["Define closure: function + lexical environment it was created in","Key point: the function remembers and can access variables from its birthplace scope","Common uses: data privacy, state preservation, function factories, callbacks","Best to show code example (counter, debounce, throttle, module pattern etc.)","Be prepared for follow-up: memory leak risk, classic for-loop closure trap"]

参考答案

A closure is a function that remembers and can access variables from its lexical scope even when the function is executed outside that scope. Example (counter): ```javascript function createCounter() { let count = 0; return function() { return ++count; }; } const counter = createCounter(); console.log(counter()); // 1 console.log(counter()); // 2 ```

Technical
Easy

Please explain what a closure is and provide a simple real-world example of using a closure.

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Answer Tips

["Define closure: function + lexical environment it was created in","Key point: the function remembers and can access variables from its birthplace scope","Common uses: data privacy, state preservation, function factories, callbacks","Best to show code example (counter, debounce, throttle, module pattern etc.)","Be prepared for follow-up: memory leak risk, classic for-loop closure trap"]

Sample Answer

A closure is a function that remembers and can access variables from its lexical scope even when the function is executed outside that scope. Example (counter): ```javascript function createCounter() { let count = 0; return function() { return ++count; }; } const counter = createCounter(); console.log(counter()); // 1 console.log(counter()); // 2 ```

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