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- 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.
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- What is JavaScript? A high-level, interpreted programming language called JavaScript makes it possible to create interactive web pages and online apps with dynamic functionality.
- What are the different data types in JavaScript? JavaScript has six primitive data types: Number. String. Boolean. Null. Undefined. Symbol. It also has two compound data types
- What is hoisting in JavaScript? Hoisting is a JavaScript concept that refers to the process of moving declarations to the top of their scope. This means that variables and functions can be used before they are declared, as long as they are declared before they are used in a function.
- What is the difference between null and undefined? null is an assignment value that represents no value or an empty value, while undefined is a variable that has been declared but not assigned a value.
- Javascript Interview Questions For Freshers
- Javascript Interview Questions For Experienced
- Javascript Interview Questions For 5 Years Experience
- Javascript Interview Questions For 10+ Years Experience
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1. What is JavaScript?
JavaScript is a very powerful client-side scripting language. JavaScript is used mainly for enhancing the interaction of a user with the webpage. In other words, you can make your webpage more lively and interactive, with the help of JavaScript. JavaScript is also being used widely in game development and Mobile application development. 👉 Free PDF Download: JavaScript Interview Questions & Answers >>
2. Enumerate the differences between Java and JavaScript?
Java is a complete programming language. In contrast, JavaScript is a coded program that can be introduced to HTML pages. These two languages are not at all inter-dependent and are designed for different intent. Java is an object-oriented programming (OOPS) or structured programming languages like C++ or C, whereas JavaScriptis a client-side scripting language.
3. What are JavaScript Data Types?
Following are the JavaScript Data types: 1. Number 2. String 3. Boolean 4. Object 5. Undefined
26. What would be the result of 3+2+”7″?
Since 3 and 2 are integers, they will be added numerically. And since 7 is a string, its concatenation will be done. So the result would be 57.
27. How to detect the operating system on the client machine?
In order to detect the operating system on the client machine, the navigator. Platform string (property) should be used.
28. What do you mean by NULL in Javascript?
The NULL value is used to represent no value or no object. It implies no object or null string, no valid boolean value, no number, and no array object.
51. What is the use of the Push method in JavaScript?
The push method is used to add or append one or more elements to an Array end. Using this method, we can append multiple elements by passing multiple arguments.
52. What is the unshift method in JavaScript?
Unshift method is like the push method, which works at the beginning of the array. This method is used to prepend one or more elements to the beginning of the array.
53. What is the difference between JavaScript and Jscript?
Both are almost similar. Netscape and Jscript develop JavaScript was developed by Microsoft.
81. Why you should not use innerHTML in JavaScript?
innerHTML content is refreshed every time and thus is slower. There is no scope for validation in innerHTML. Therefore, it is easier to insert rogue code in the document and make the web page unstable.
82. What does the following statement declare?
It declares a three-dimensional array.
83. How are JavaScript and ECMA Script related?
ECMA Script is like rules and guidelines, while Javascript is a scripting language used for web development.
Prepare for your JavaScript interview with this comprehensive list of questions and answers. Learn about data types, functions, loops, timers, variables, and more.
- 1) What is JavaScript? JavaScript is a scripting language. It is different from Java language. It is object-based, lightweight, cross-platform translated language.
- 2) List some features of JavaScript. Some of the features of JavaScript are: Lightweight. Interpreted programming language. Good for the applications which are network-centric.
- 3) Who developed JavaScript, and what was the first name of JavaScript? JavaScript was developed by Brendan Eich, who was a Netscape programmer. Brendan Eich developed this new scripting language in just ten days in the year September 1995.
- 4) List some of the advantages of JavaScript. Some of the advantages of JavaScript are: Server interaction is less. Feedback to the visitors is immediate. Interactivity is high.
- What are the differences between Java and JavaScript? JavaScript is a client-side scripting language and Java is object Oriented Programming language.
- What are JavaScript Data Types? There are three major Data types in JavaScript. Primitive. Numbers. Strings. Boolean. Symbol. Trivial. Undefined. Null. Composite. Objects.
- Which symbol is used for comments in JavaScript? Comments prevent the execution of statements. Comments are ignored while the compiler executes the code.
- What would be the result of 3+2+”7″? Here, 3 and 2 behave like an integer, and “7” behaves like a string. So 3 plus 2 will be 5. Then the output will be 5+”7″ = 57.
List of 1000 JavaScript Interview Questions. Contribute to sudheerj/javascript-interview-questions development by creating an account on GitHub.
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Test your JavaScript skills with these technical questions from Toptal, a network of top freelance developers. Learn how to handle closures, prototypes, inheritance, and more.
