Glassdoor Node Js Interview Questions

Glassdoor Node Js Interview Questions

Glassdoor Node.js Interview Questions and Answers

Glassdoor Node Js Interview Questions

Glassdoor Node.js interview questions are valuable for both candidates and recruiters. They provide candidates with insights into the types of questions they can expect during an interview, allowing them to prepare effectively. For recruiters, these questions help assess a candidate's technical skills, understanding of Node.js concepts, and ability to apply their knowledge in practical scenarios. They cover various aspects of Node.js, including core concepts, best practices, debugging techniques, and common challenges, ensuring a thorough evaluation of a candidate's expertise in this technology.

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1 - What are the different ways to create an array in JavaScript?

     Using square brackets

     Using the Array constructor

     Using the Array.from() method

2) What is the difference between a `const` and `let` declaration?

     `const` declares a constant variable that cannot be reassigned.

     `let` declares a variable that can be reassigned.

3) What is the output of the following code?

    javascript

   const myArray = [1, 2, 3];

   const newArray = myArray.map((item) => item + 1 -;

   console.log(myArray); // [1, 2, 3]

   console.log(newArray); // [2, 3, 4]

     The `map()` method creates a new array by transforming each element in the original array using the provided callback function. In this case, the callback function adds 1 to each element, resulting in a new array with the values [2, 3, 4]. The original array remains unchanged.

4) What is the purpose of the `async` keyword in JavaScript?

     The `async` keyword is used to declare an asynchronous function. Asynchronous functions return a Promise, and they can be used to perform asynchronous operations, such as making network requests or reading files.

5) What is the difference between a Promise and an Observable?

     A Promise represents a single value that will be available at some point in the future. An Observable represents a stream of values that can be emitted over time. Promises are typically used for handling asynchronous operations, while Observables are used for handling asynchronous streams of data.

6) What are the advantages of using functional programming in JavaScript?

     Functional programming promotes immutability, which can help to reduce bugs and make code more predictable.

     Functional programming encourages the use of pure functions, which makes it easier to test and reason about code.

7) What is the difference between a class and an object in JavaScript?

     A class is a blueprint for creating objects. It defines the properties and methods that objects of that class will have. An object is a specific instance of a class.

8) What is the purpose of the `this` keyword in JavaScript?

     The `this` keyword refers to the current object. It can be used to access the properties and methods of the current object.

9) What is the difference between a constructor function and a regular function in JavaScript?

     A constructor function is used to create new objects. It is called with the `new` keyword. A regular function is not used to create new objects. It is called directly.

10) What are the different ways to inherit from a class in JavaScript?

     Using the `extends` keyword

     Using the Object.create() method

11 - What is the purpose of the `super` keyword in JavaScript?

     The `super` keyword refers to the parent class of the current class. It can be used to access the properties and methods of the parent class.

12) What are the different ways to define a getter and setter in JavaScript?

     Using the `get` and `set` keywords

     Using the Object.defineProperty() method

13) What is the difference between a property and a method in JavaScript?

     A property is a value that is stored in an object. A method is a function that is defined on an object.

14) What is the purpose of the `bind()` method in JavaScript?

     The `bind()` method creates a new function that is bound to a specific value of `this`. This can be useful for creating event handlers or for passing functions around as parameters.

15) What are the different ways to create a module in JavaScript?

     Using the `export` and `import` keywords

     Using the CommonJS module system

     Using the AMD module system

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