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Return: Quiz IV in JavaScript - Time Complexity: O(1)


Quiz: What would this code produce if we were to copy-paste it in a code editor and run it?

function greetAndReturn() {
    return "How are you doing?";
    console.log("Hey bro!");
}

let question = greetAndReturn();
console.log(question);

Options:

  • A: It would print:

    Hey bro!
How are you doing?

  • B: It would print:

    How are you doing?

  • C: It would print:

    How are you doing?
Hey bro!

  • D: It would print:

    Hey bro!

Important Note:

Do not use an actual code editor to get the answer! It would defy the whole purpose of the quiz!

Instructions:

Pick your answer and assign variable answer in the code editor with that answer.

For example, if you think the answer to the quiz is B, write answer = "B" in the code editor and press Validate Solution!.

Understanding the Problem

The core challenge of this problem is understanding the behavior of the return statement in JavaScript and how it affects the execution of subsequent code within the same function.

In JavaScript, the return statement immediately exits the function and returns the specified value. Any code after the return statement within the same function will not be executed.

Approach

To solve this problem, we need to analyze the given code step-by-step:

  1. The function greetAndReturn is defined. It contains a return statement followed by a console.log statement.
  2. When the function is called, it will execute the return statement, which will return the string "How are you doing?" and exit the function immediately.
  3. The console.log statement inside the function will not be executed because it is placed after the return statement.
  4. The returned value is assigned to the variable question.
  5. The value of question is then logged to the console.

Algorithm

Here is a step-by-step breakdown of the algorithm:

  1. Define the function greetAndReturn.
  2. Inside the function, use the return statement to return the string "How are you doing?".
  3. Note that the console.log statement after the return statement will not be executed.
  4. Call the function and assign its return value to the variable question.
  5. Log the value of question to the console.

Code Implementation

function greetAndReturn() {
    // Return the string and exit the function
    return "How are you doing?";
    // This line will not be executed
    console.log("Hey bro!");
}

// Call the function and store the return value in 'question'
let question = greetAndReturn();

// Log the return value to the console
console.log(question);

Complexity Analysis

The time complexity of this code is O(1) because it involves a constant number of operations regardless of the input size. The space complexity is also O(1) as it uses a fixed amount of space for the function and the variable question.

Edge Cases

There are no significant edge cases for this problem as the function behavior is straightforward and does not depend on any input.

Testing

To test the solution, we can run the code and observe the output. The expected output is:

How are you doing?

This confirms that the console.log statement inside the function is not executed.

Thinking and Problem-Solving Tips

When solving problems involving function behavior, it is crucial to understand the flow of execution, especially how return statements affect the function. Practice by writing small functions and observing their behavior to build a strong understanding.

Conclusion

In this problem, we explored the behavior of the return statement in JavaScript and how it affects the execution of subsequent code within the same function. Understanding this concept is essential for writing correct and efficient code.

Additional Resources