Could you write the code for the promisify() function that transforms callback-based functions into Promise-based ones in JavaScript?

Very hard Difficulty

Very-hard questions are the ultimate test of your expertise and preparation. They demand not just knowledge, but creativity and strategic thinking, often addressing unique or highly technical aspects of your field.

Javascript question

JavaScript questions test your proficiency with this versatile programming language. Demonstrate your understanding of language fundamentals, asynchronous programming, frameworks, and how you build dynamic web applications.

Here's a Hint

Consider how to wrap a callback-style function that follows the Node.js convention (error-first callbacks) into a function that returns a Promise.