| S.No | Question |
|---|---|
| 1. | What is JavaScript? How JavaScript is different from java? |
| 2. | How to use JavaScript client side and server side? |
| 3. | What are the features of JavaScript? |
| 4. | Which JavaScript version you are using currently? |
| 5. | How Browser Execute the Javascript code? |
| 6. | Is JavaScript a case-sensitive language? |
| 7. | What is call stack? How call stack work? What is meaning of global execution context? |
| 8. | What do you thing javascript is single threaded or multithreaded scripting language? |
| 9. | What are the advantages of JavaScript? |
| 10. | Name some of the built-in methods and the values returned by them. |
| 11. | Name some of the JavaScript Frameworks. |
| 12. | What are Exports & Imports? |
| S.No | Question |
|---|---|
| 1. | What are the operators in javascript? How many types of operators? |
| 2. | Tell me any operator in javascript which is not present is c or cpp or java or python? |
| 3. | What is difference between == and === operator in js? |
| 4. | Can you multiply and divide any integer by 2 without using arithmetic operator? |
| 5. | Exchange two values without using third variable and without using arithmetic operator? |
| 6. | Explain Datatypes supported by javascript? |
| 7. | What is difference between undefined and null? |
| 8. | Where to use undefined and where to use null? |
| 9. | How to define variable in javascript? |
| 10. | var v/s let v/s const? |
| 11. | What is hoisting in javascript? |
| 12. | What will be result of following two statment? a. undefined == null b. undefined === null |
| 13. | How can you create an object in JavaScript? |
| 14. | What are the scopes of a variable in JavaScript? |
| 15. | What are the variable naming conventions in JavaScript? |
| 16. | How does TypeOf Operator work? |
| 17. | What are the ways to define a variable in JavaScript? |
| 18. | What is a Typed language? |
| 19. | What is the difference between Local storage & Session storage? |
| 20. | What is the difference between undeclared & undefined? |
| 21. | What is the difference between window & document in JavaScript? |
| 22. | What is the difference between innerHTML & innerText? |
| 23. | What is NaN in JavaScript? |
| 24. | How do JavaScript primitive/object types passed in functions? |
| 25. | How can you convert the string of any base to integer in JavaScript? |
| 26. | What is a prompt box in JavaScript? |
| 27. | What will be the output of the following code? var Employee = { company: 'xyz' }; var Emp1 = Object.create(Employee); delete Emp1.company; console.log(Emp1.company); |
| 28. | What will be the output of the code below? //nfe (named function expression) var Foo = Function Bar() { return 7; }; typeof Bar(); |
| S.No | Question |
|---|---|
| 1. | How many ways to execute statement conditionally in javascript? |
| 2. | Write A Javascript syntax to make use of nested if-else statement? |
| 3. | What is difference between if and switch statement? Where to use if and where to use switch? |
| 4. | What is javascript program to check given number is even or odd using switch case? |
| 5. | Is it mandatory to make use of default case in switch statement? |
| 6. | Can we make default case first statement in switch case? |
| 7. | Can we use variable expression as case label? |
| S.No | Question |
|---|---|
| 1. | What is iterative problem and how to solve it in javascript? |
| 2. | How many types of loop in javascript? |
| 3. | What are the differences between while and do-while? |
| 4. | Can you write a syntax of for loop in which it work like as while loop? |
| 5. | How for in and for of works? Explain with the help of example? |
| 6. | What are the differences between for in and for of loop? |
| 7. | Can we iterate array in javascript? |
| S.No | Question |
|---|---|
| 1. | What is function? Why to use function? What are the advantage of using function in javascript? |
| 2. | How many way to define function in javascript? |
| 3. | How to pass data and return data to/from the function? |
| 4. | What is arrow function in js? |
| 5. | What is callback and error callback? |
| 6. | What is callback hell? Eplain with the help of example? How to overcome callback hell? |
| 7. | What is function expression, function statement explain with help of example? |
| 8. | What is difference between function expression and function statement? |
| 9. | What is a name function in JavaScript & how to define it. |
| 10. | Can you assign an anonymous function to a variable and pass it as an argument to another function? |
| 11. | What is argument objects in JavaScript & how to get the type of arguments passed to a function? |
| 12. | What is Callback? |
| 13. | What is Closure? Give an example. |
| 14. | What is the ‘Strict’ mode in JavaScript and how can it be enabled? |
| 15. | What is the reason for wrapping the entire content of a JavaScript source file in a function book? |
| 16. | What is the difference between Call & Apply? |
| 17. | What will be the output of the following code? var output = (function(x) { delete x; return x; })(0); console.log(output); |
| 18. | What will be the output of the following code? var Output = (function() { delete X.foo; return X.foo; })(); console.log(output); |
| 19. | Explain setInterval(), setTimeout(), clearInterval(), clearTimeout(). |
| S.No | Question |
|---|---|
| 1. | What is events in javascript? |
| 2. | Tell us the name of any 5 event in javascript? |
| 3. | How to apply click event on html dom element by using javascript code (not to use onclick on dom element)? |
| 4. | What is addEventListener? |
| 5. | What is event bubbling and event capturing? |
| 6. | onclick, ondblclick, onkeyup, onkeypress , onchange, onblur explain with example. |
| 7. | What is this Keyword in JavaScript? |
| 8. | What is an event bubbling in JavaScript? |
| S.No | Question |
|---|---|
| 1. | What is DOM? |
| 2. | Create funtionality to show and hide password. |
| 3. | Write a javascript program to swap to images on button click? |
| 4. | Perform the addition of two number using js? |
| 5. | How to apply css class and remove css class from a particular dom element? |
| 6. | Write javascript code to validate the signup field (username,email,password, mobile,qualification-list.)? |
| 7. | List out the different ways an DOM element can be accessed in javascript? |
| 8. | How to create a cookie using JavaScript? |
| 9. | How to read a cookie using JavaScript? |
| 10. | How to delete a cookie using JavaScript? |
| 11. | What is the difference between Attributes and Property? |
| 12. | List out the different ways an HTML element can be accessed in a JavaScript code. |
| 13. | In how many ways a JavaScript code can be involved in an HTML file? |
| S.No | Question |
|---|---|
| 1. | What is an array in javascript? |
| 2. | When to use an array concept? |
| 3. | How can you create an Array in JavaScript? |
| 4. | How to empty an Array in JavaScript? |
| S.No | Question |
|---|---|
| 1. | What would be the result of 2+5+”3″? |
| 2. | What are escape characters in JavaScript? |
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