নিচের কোন কৌশলটি অর্থের সময় মূল্যকে বিবেচনা করেনা

Question: What will be logged to the console after executing the following JavaScript code snippet?

function counter() {
    let count = 0;
    return function() {
        count++;
        return count;
    };
}

const increment = counter();
console.log(increment());
console.log(increment());

Options:

    
• A) 1 then 1
    
• B) 1 then 2
    
• C) undefined then undefined
    
• D) ReferenceError

Correct Answer: B) 1 then 2

Detailed Explanation:

This question evaluates your understanding of closures and scope persistence in JavaScript.

    
• What is a Closure? A closure gives an inner function access to its outer function's scope even after the outer function has closed or returned.
    
• Execution Flow:         
              
  • Calling counter() instantiates a new execution context where the local variable count is initialized to 0.
              
  • The returned inner function forms a closure that maintains a persistent reference to the variable count.
              
  • The first call, increment(), modifies count from 0 to 1 and outputs 1.
              
  • The second call, increment(), references the same updated variable in memory, increasing count to 2 and outputting 2.
          
      
    
• Why other options are incorrect:         
              
  • A is incorrect because the variable count is not reset on subsequent function calls; the lexical environment persists across invocations.
              
  • C is incorrect because the inner function explicitly returns the updated numerical value of count.
              
  • D is incorrect because count remains accessible within the lexical scope chain, so no error is thrown.