LeetCode 2704. To Be Or Not To Be

Summary

This video provides a step-by-step explanation for solving a LeetCode problem (#2704) titled 'To Be or Not To Be.' The problem requires writing a function that accepts a value and returns an object containing two functions: 'toB' and 'notToB.' The 'toB' function checks if the input value is equal to the initially accepted value, returning true or throwing an error if not equal. Conversely, the 'notToB' function returns true if the input value is not equal to the initially accepted value, and throws an error if equal. The video guide walks through the solution, highlighting the usage of closures and providing examples to reinforce understanding.

Takeaways

• 🔑 The video explains how to solve LeetCode problem #2704 titled 'To Be or Not to Be'.
• 🧐 The problem requires writing a function that accepts a value and returns an object with two functions: 'toB' and 'notToB'.
• 🤖 The 'toB' function should return true if the input value matches the value passed to the initial function, otherwise throw an error.
• 🚫 The 'notToB' function should throw an error if the input value matches the value passed to the initial function, otherwise return true.
• 🔁 The solution demonstrates the use of closures, where the inner functions ('toB' and 'notToB') have access to the value from the outer function.
• 📝 The script walks through the solution code, explaining each step and the logic behind it.
• 💻 Example use cases are provided to test the solution.
• ✅ The solution is accepted by LeetCode, indicating that it passes all test cases.
• 🎯 The video aims to help viewers understand the problem and its solution approach.
• 📹 The overall tone of the video is instructional, guiding viewers through the problem-solving process.

Q & A

What is the purpose of the given code problem?

The purpose of the given code problem is to write a function that accepts a value and returns an object containing two functions: 'toB' and 'notToB'. The 'toB' function should return true if the value passed to it is equal to the initially accepted value, and throw an error otherwise. The 'notToB' function should throw an error if the value passed to it is equal to the initially accepted value, and return true otherwise.

What is the significance of the 'closure' concept mentioned in the video?

The concept of closures is mentioned in the video because the solution to this problem involves creating nested functions (the 'toB' and 'notToB' functions) that have access to the value parameter passed to the outer function. This is a classic example of closures, where the inner functions maintain a reference to the outer function's environment, even after the outer function has finished executing.

Can you provide an example usage of the expected solution?

Sure, here's an example usage of the expected solution: ```javascript const obj = acceptAValue(42); const toB = obj.toB; const notToB = obj.notToB; console.log(toB(42)); // true console.log(notToB(42)); // Error: Value is equal console.log(toB(100)); // Error: Value is not equal console.log(notToB(100)); // true ```

What is the purpose of throwing an error in the 'toB' and 'notToB' functions?

The purpose of throwing an error in the 'toB' and 'notToB' functions is to handle the case when the input value does not meet the expected condition. In the 'toB' function, an error is thrown if the input value is not equal to the initially accepted value, while in the 'notToB' function, an error is thrown if the input value is equal to the initially accepted value. This behavior is specified in the problem statement.

How does the solution handle the case when the input value is equal to the initially accepted value for the 'toB' function?

When the input value passed to the 'toB' function is equal to the initially accepted value, the solution simply returns 'true' without any further processing. This is done by using an early return statement (`return true;`) if the condition `value === acceptedValue` is met.

How does the solution handle the case when the input value is not equal to the initially accepted value for the 'notToB' function?

When the input value passed to the 'notToB' function is not equal to the initially accepted value, the solution returns 'true'. This is done by using an early return statement (`return true;`) if the condition `value !== acceptedValue` is met.

What is the advantage of using closures in this problem's solution?

The advantage of using closures in this problem's solution is that it allows the 'toB' and 'notToB' functions to maintain access to the initially accepted value, even after the outer function ('acceptAValue') has finished executing. This eliminates the need to pass the accepted value as an argument to the inner functions or store it in a global variable, making the code more modular and easier to maintain.

Can you explain the process of testing and submitting the solution mentioned in the video?

In the video, the process of testing and submitting the solution is as follows: 1. The solution code is provided. 2. Example use cases are shown, where the 'toB' and 'notToB' functions are called with different input values, and the expected output is displayed. 3. The solution is run against test cases, and it is mentioned that the solution is accepted. 4. Finally, the solution is submitted, indicating that it passes all the test cases.

What is the time complexity of the solution presented in the video?

The time complexity of the solution presented in the video is O(1), or constant time complexity. This is because the operations performed in the 'toB' and 'notToB' functions are simple comparisons and return statements, which take constant time regardless of the input size.

Can you suggest any potential improvements or alternative approaches to the solution?

One potential improvement to the solution could be to use a more descriptive naming convention for the 'toB' and 'notToB' functions, as their names may not immediately convey their purpose. An alternative approach could be to combine the functionality of both functions into a single function that takes a boolean parameter to determine whether to check for equality or inequality with the initially accepted value. However, this approach may make the code slightly less readable and violate the problem's requirement of returning two separate functions.