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 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';
3/25 How do you declare a new date in JavaScript?
- var date = Date();
- var date = date('now');
- var date = new Date();
- var date = date().current();
4/25 Which array method sorts the elements of an array?
- sort()
- changeOrder(order)
- order()
- None of the above metjods
5/25 How do you write anything into the web page in JavaScript?
- window.write(...)
- document.write(...)
- window.page.write(...)
- document.page.write(...)
6/25 How do you create a new function in JavaScript?
- new.function() {}
- function myFunction() {}
- function:myFunction() {}
- function = myFunction() {}

7/25 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

8/25 Which is undefined variable?

var1 = "12";
if (var2) {
  delete var2;
} else if (var1) {
  delete var1;
}

None
both
only var1
only var2

9/25 The JavaScript Date is fundamentally specified as ___
- The number of milliseconds elapsed since January 1, 1970
- The number of picoseconds elapsed since January 1, 1970
- The number of minutes elapsed since January 1, 1980
- The number of days that have elapsed since January 1, 1980
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 Which of the following is the correct way to write “Welcome to W3docs” on the web page?
- document.write(“Welcome to W3docs”);
- system.out.println(“Welcome to W3docs”);
- print(“Welcome to W3docs”);
- response.write(“Welcome to W3docs”);
12/25 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]
13/25 Which are closures?
- Variables
- Objects
- Functions
- All of the above options
14/25 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
15/25 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
16/25 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
17/25 JavaScript is not a case-sensitive language.
- True
- False
18/25 Which of these is a correct way to declare an arrow function in JavaScript?
- function() => {}
- () => {}
- => function() {}
- () -> {}
19/25 In JavaScript, what will 'typeof null' return?
- 'null'
- 'object'
- 'undefined'
- 'none'
20/25 Which method is used to serialize an object into a JSON string in JavaScript?
- JSON.stringify()
- JSON.parse()
- Object.toString()
- Stringify.object()
21/25 What does 'Event Bubbling' mean in JavaScript?
- An error in event handling
- When an event is directly handled by the element that it occurs on
- When an event propagates from the innermost to the outermost element
- The process of triggering multiple events in a sequence
22/25 What is the use of 'break' in JavaScript?
- To stop the execution of a loop
- To break the code into multiple lines
- To exit a function
- To pause the debugger
23/25 How can you prevent a default action in an event handler in JavaScript?
- event.preventDefault()
- event.stop()
- preventDefault()
- event.stopPropagation()
24/25 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
25/25 How can you convert the string '3.14' to a number in JavaScript?
- Number('3.14')
- parseNum('3.14')
- int('3.14')
- parseFloat('3.14')
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Javascript Basics

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

2/25 Which of the following is the correct syntax to redirect a URL using JavaScript?

3/25 How do you declare a new date in JavaScript?

4/25 Which array method sorts the elements of an array?

5/25 How do you write anything into the web page in JavaScript?

6/25 How do you create a new function in JavaScript?

7/25 What is the function of the below code snippet?

8/25 Which is undefined variable?

9/25 The JavaScript Date is fundamentally specified as ___

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

11/25 Which of the following is the correct way to write “Welcome to W3docs” on the web page?

12/25 What will be the output of the following code piece?

13/25 Which are closures?

14/25 What should be done for lexical scoping implementation?

15/25 Which of the following options is right for dynamic scoping?

16/25 What will be the output of the following statement?

17/25 JavaScript is not a case-sensitive language.

18/25 Which of these is a correct way to declare an arrow function in JavaScript?

19/25 In JavaScript, what will 'typeof null' return?

20/25 Which method is used to serialize an object into a JSON string in JavaScript?

21/25 What does 'Event Bubbling' mean in JavaScript?

22/25 What is the use of 'break' in JavaScript?

23/25 How can you prevent a default action in an event handler in JavaScript?

24/25 What does the 'map' method do in JavaScript?

25/25 How can you convert the string '3.14' to a number in JavaScript?