Javascript Basics

1/25 How do you write "Hello W3docs" in an alert box?
- alertBox("Hello W3docs");
- alert("Hello W3docs");
- msg("Hello W3docs");
- msgBox("Hello W3docs");
- modal("Hello W3docs")
2/25 Which is the correct way to write a comment in JavaScript?
- {# ... #}
- <!--- .... ---!>
- // ....
- \\ ...
3/25 How can you detect the application name of the client’s browser?
- navigator.appName
- navigator.browserName
- browser.name

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 Which of the following is the correct syntax to redirect a URL using JavaScript?
- document.location='http://www.w3docs.com';
- navigator.location='http://www.w3docs.com';
- window.location='http://www.w3docs.com';
- browser.location='http://www.w3docs.com';
6/25 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)
7/25 How do you write anything into the web page in JavaScript?
- window.write(...)
- document.write(...)
- window.page.write(...)
- document.page.write(...)
8/25 Can you set any style to HTML tag using JavaScript?
- yes
- no

9/25 What is the function of the below code snippet?

var scope = "global scope";

function checkscope() {

  var scope = "local scope";

  function func() {

    return scope;

  }

  return func;

}

Returns value null
Returns exception
Returns the value in scope
None of the mentioned

10/25 Which of the following is the correct way to write an array?
- let fruits = new Array(1:"apple",2:"peach",3:"banana");
- let fruits = new Array:1=(" apple ")2=("peach")3=("banana");
- let fruits = new Array("apple ","peach","banana");
- let fruits = new Array="apple","peach","banana";
11/25 The pop() method removes the last item from an array and returns a new array.
- False
- True
12/25 Which of the following is used to identify the array?
- ===
- typeof
- isarrayType()
- ==
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 JavaScript is not a case-sensitive language.
- True
- False
16/25 Which JavaScript method is used to iterate over all properties of an object?
- Object.forEach()
- for...in
- Object.loop()
- forEach()
17/25 What does the 'splice' method do in an array?
- Removes and/or adds new elements to an array
- Joins two arrays into one
- Sorts the elements of an array
- Finds the index of an element in the array
18/25 How do you declare a class named 'Car' in JavaScript?
- class Car {}
- function Car() {}
- new Class(Car)
- createClass('Car')
19/25 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
20/25 How do you define an async function in JavaScript?
- function async() {}
- async function() {}
- function() async {}
- async() function {}
21/25 Which method is used to add one or more elements to the beginning of an array?
- unshift()
- shift()
- push()
- prepend()
22/25 How can you prevent a default action in an event handler in JavaScript?
- event.preventDefault()
- event.stop()
- preventDefault()
- event.stopPropagation()
23/25 What does the 'map' method do in JavaScript?
- Maps a value to a key in an object
- Creates a new array with the results of calling a function for every array element
- Applies a function against an accumulator and each element in the array (from left to right)
- Searches for elements in an array that match a condition
24/25 Which JavaScript method is used to sort the elements of an array?
- array.sort()
- sort(array)
- array.order()
- order(array)
25/25 Which JavaScript property is used to write a message to the console?
- document.write()
- console.log()
- window.print()
- alert()
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Javascript Basics

1/25 How do you write "Hello W3docs" in an alert box?

2/25 Which is the correct way to write a comment in JavaScript?

3/25 How can you detect the application name of the client’s browser?

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

5/25 Which of the following is the correct syntax to redirect a URL using JavaScript?

6/25 How do you round the number 5.35 to the nearest integer?

7/25 How do you write anything into the web page in JavaScript?

8/25 Can you set any style to HTML tag using JavaScript?

9/25 What is the function of the below code snippet?

10/25 Which of the following is the correct way to write an array?

11/25 The pop() method removes the last item from an array and returns a new array.

12/25 Which of the following is used to identify the array?

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 JavaScript is not a case-sensitive language.

16/25 Which JavaScript method is used to iterate over all properties of an object?

17/25 What does the 'splice' method do in an array?

18/25 How do you declare a class named 'Car' in JavaScript?

19/25 What is the purpose of the 'reduce' method in JavaScript?

20/25 How do you define an async function in JavaScript?

21/25 Which method is used to add one or more elements to the beginning of an array?

22/25 How can you prevent a default action in an event handler in JavaScript?

23/25 What does the 'map' method do in JavaScript?

24/25 Which JavaScript method is used to sort the elements of an array?

25/25 Which JavaScript property is used to write a message to the console?