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Oct 23, 2020 · This article will discuss some of the most frequently asked questions in JavaScript with the intention of helping readers overcome any confusion they may have around this language. Question What are the states of a promise?
- Manu Bhardwaj
Jan 18, 2024 · Explore JavaScript Promises with exercises on random resolution, chained arithmetic, parallel data fetching, fastest response, and cancellation. Improve your async skills with concise code and clear explanations. Learn effective methods for handling promises, simplifying errors, and creating resilient, maintainable code.
Oct 4, 2024 · 1. What is a promise, and how do you handle it? A promise is an object that represents an asynchronous operation. To handle a promise, you use the then () method, which allows you to add a callback function to be executed when the promise is resolved or rejected. 2. How do you resolve a promise?
- Can you explain what a Promise is in JavaScript and its states? A Promise in JavaScript is an object representing the eventual completion or failure of an asynchronous operation.
- How do Promises improve readability and maintainability in asynchronous programming? Promises in asynchronous programming enhance readability by providing a clear, linear flow of control.
- Could you clarify the difference between callbacks and Promises in JavaScript? Callbacks and Promises in JavaScript are both techniques for handling asynchronous operations, but they differ significantly.
- How would you handle errors in a Promise-based code? In Promise-based code, errors are handled using the .catch() method. This method is chained at the end of a promise chain and it catches any error that occurs in the preceding promises.
- What are the different data types present in javascript? To know the type of a JavaScript variable, we can use the typeof operator. 1. Primitive types.
- Explain Hoisting in javascript. Hoisting is the default behaviour of javascript where all the variable and function declarations are moved on top. This means that irrespective of where the variables and functions are declared, they are moved on top of the scope.
- Why do we use the word “debugger” in javascript? The debugger for the browser must be activated in order to debug the code. Built-in debuggers may be switched on and off, requiring the user to report faults.
- Difference between “ == “ and “ === “ operators. Both are comparison operators. The difference between both the operators is that “==” is used to compare values whereas, “ === “ is used to compare both values and types.
May 25, 2024 · In this article, we’ll go over some commonly asked interview questions on JS promises. 1 What is the difference between Promise.all and Promise.allSettled? Promise.all and...
Aug 14, 2020 · To get a job as a front end developer, we need to nail the coding interview. Promises are important parts of JavaScript because of the pervasive use of asynchronous programming. In this article, we’ll look at some common questions about JavaScript promises.
