Javascript Basics

1/25 Which is the correct way to write a comment in JavaScript?
- {# ... #}
- <!--- .... ---!>
- // ....
- \\ ...
2/25 How can you detect the application name of the client’s browser?
- navigator.appName
- navigator.browserName
- browser.name

3/25 What is the result of "w3docs" variable?

var w3docs;

if (10 > 4) {

  w3docs = true;

} else {

  w3docs = 55;

}

true
55
undefined

4/25 What is the value of "elem" variable?

var elem;

if (11 == 11 && 12 < 10) {

  elem = 12;

} else {

  elem = "undefined";

}

true
'undefined'
12

5/25 How do you round the number 5.35 to the nearest integer?
- rnd(5.35)
- Math.rnd(5.35)
- round(5.35)
- Math.round(5.35)
6/25 Which of the following events occurs when the user clicks on an HTML element?
- onchange
- onmouseover
- onmouseclick
- onclick
- onmouseup

7/25 Which is undefined variable?

var1 = "12";

if (var2) {

  delete var2;

} else if (var1) {

  delete var1;

}

None
both
only var1
only var2

8/25 Which of the following is the correct syntax for opening a new window called "w3docs"?
- w3docs = window.open.new("http://www.w3docs.com");
- w3docs = window.new("http://www.w3docs.com");
- w3docs = window.open("http://www.w3docs.com");
- w3docs = window("http://www.w3docs.com");
9/25 Which of the following does the pop() method do?
- It increments the total length by 1
- It decrements the total length by 1
- It prints the first element but no effect on the length
- None of the above options
10/25 What will be the output of the following code piece?
```
let arr = [1,2,3,4,5];

arr.slice(0,3);
```
- Returns [4,5]
- Returns [1,2,3,4]
- Returns [1,2,3]
- Returns [1,2,3,4,5]
11/25 What should be done for lexical scoping implementation?
- Getting the object
- Referencing the current scope chain
- Dereferencing the current scope chain
- None of the above options
12/25 Which of the following options is the opposite of the lexical scoping?
- Literal scoping
- Dynamic scoping
- Generic scoping
- Static scoping
13/25 Which of the following options is right for dynamic scoping?
- Variables can be declared outside the scope
- Variables cannot be declared outside the scope
- Variables must be declared outside the scope
- None of the mentioned
14/25 What will be the output of the following statement?
```
let total = eval("10*10+8");
```
- 10*10+8
- 108 as an integer value
- 108 as a string
- Exception is thrown
15/25 What is the purpose of the 'const' keyword in JavaScript?
- To declare a variable that might change later
- To declare a constant variable whose value cannot be changed
- To create a new function
- To define a conditional statement
- To import a module
16/25 What does 'this' refer to in a JavaScript method?
- The global object
- The function itself
- The object that called the method
- The document object
17/25 What is the use of the 'async' keyword in JavaScript?
- To pause the execution of a function
- To declare a function as asynchronous
- To speed up code execution
- To synchronize two functions
18/25 Which event occurs when a user clicks on an HTML element in JavaScript?
- onmouseover
- onclick
- onchange
- onhover
19/25 How do you declare a class named 'Car' in JavaScript?
- class Car {}
- function Car() {}
- new Class(Car)
- createClass('Car')
20/25 What is the purpose of the 'reduce' method in JavaScript?
- To reduce the size of an array
- To execute a reducer function on each element of the array, resulting in a single output value
- To filter out elements from an array
- To count the number of elements in an array
21/25 What is the result of 'typeof NaN' in JavaScript?
- 'number'
- 'NaN'
- 'undefined'
- 'null'
22/25 Which method in an array adds new elements to the end of an array?
- push()
- pop()
- shift()
- unshift()
23/25 Which JavaScript method is used to remove the last element from an array and return that element?
- pop()
- push()
- last()
- removeLast()
24/25 How do you find the number with the highest value of two numbers in JavaScript?
- Math.max(x, y)
- Math.highest(x, y)
- top(x, y)
- Math.maximum(x, y)
25/25 What method is used to transform a string into an integer in JavaScript?
- int.parse()
- Number.parseInt()
- parseInt()
- Math.parseInt()
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Javascript Basics

1/25 Which is the correct way to write a comment in JavaScript?

2/25 How can you detect the application name of the client’s browser?

3/25 What is the result of "w3docs" variable?

4/25 What is the value of "elem" variable?

5/25 How do you round the number 5.35 to the nearest integer?

6/25 Which of the following events occurs when the user clicks on an HTML element?

7/25 Which is undefined variable?

8/25 Which of the following is the correct syntax for opening a new window called "w3docs"?

9/25 Which of the following does the pop() method do?

10/25 What will be the output of the following code piece?

11/25 What should be done for lexical scoping implementation?

12/25 Which of the following options is the opposite of the lexical scoping?

13/25 Which of the following options is right for dynamic scoping?

14/25 What will be the output of the following statement?

15/25 What is the purpose of the 'const' keyword in JavaScript?

16/25 What does 'this' refer to in a JavaScript method?

17/25 What is the use of the 'async' keyword in JavaScript?

18/25 Which event occurs when a user clicks on an HTML element in JavaScript?

19/25 How do you declare a class named 'Car' in JavaScript?

20/25 What is the purpose of the 'reduce' method in JavaScript?

21/25 What is the result of 'typeof NaN' in JavaScript?

22/25 Which method in an array adds new elements to the end of an array?

23/25 Which JavaScript method is used to remove the last element from an array and return that element?

24/25 How do you find the number with the highest value of two numbers in JavaScript?

25/25 What method is used to transform a string into an integer in JavaScript?