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 What is the result of "w3docs" variable?

var w3docs;

if (10 > 4) {

  w3docs = true;

} else {

  w3docs = 55;

}

true
55
undefined

3/25 What is the value of "elem" variable?

var elem;

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

  elem = 12;

} else {

  elem = "undefined";

}

true
'undefined'
12

4/25 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)
5/25 Which of the following events occurs when the user clicks on an HTML element?
- onchange
- onmouseover
- onmouseclick
- onclick
- onmouseup
6/25 How do you get the DOM element with id in JavaScript?
- window.getElementById(...)
- document.getElementById(...)
- page.getElementById(...)
- document.innerHTML.getElementById(...)
7/25 Can you set any style to HTML tag using JavaScript?
- yes
- no

8/25 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

9/25 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”);
10/25 The pop() method removes the last item from an array and returns a new array.
- False
- True
11/25 Which of the following is used to identify the array?
- ===
- typeof
- isarrayType()
- ==
12/25 Which are closures?
- Variables
- Objects
- Functions
- All of the above options
13/25 What will happen if the return statement doesn’t have the associated expression?
- It will throw an exception
- It will return 0
- It will return undefined
- None of the above options
14/25 Which method converts a JSON string into a JavaScript object?
- JSON.parse()
- JSON.stringify()
- Object.parse()
- String.parseJSON()
- JSON.toObject()
15/25 How do you create a Promise in JavaScript?
- new Promise()
- Promise.create()
- createPromise()
- Promise()
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 In JavaScript, what will 'typeof null' return?
- 'null'
- 'object'
- 'undefined'
- 'none'
18/25 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
19/25 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
20/25 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
21/25 What will 'console.log(1 + '2' + '3')' output in JavaScript?
- '6'
- '123'
- '15'
- An error
22/25 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)
23/25 What method is used to transform a string into an integer in JavaScript?
- int.parse()
- Number.parseInt()
- parseInt()
- Math.parseInt()
24/25 What is the output of 'console.log(0.1 + 0.2 === 0.3)' in JavaScript?
- true
- false
- undefined
- error
25/25 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
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Javascript Basics

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

2/25 What is the result of "w3docs" variable?

3/25 What is the value of "elem" variable?

4/25 How do you round the number 5.35 to the nearest integer?

5/25 Which of the following events occurs when the user clicks on an HTML element?

6/25 How do you get the DOM element with id in JavaScript?

7/25 Can you set any style to HTML tag using JavaScript?

8/25 What is the function of the below code snippet?

9/25 Which of the following is the correct way to write “Welcome to W3docs” on the web page?

10/25 The pop() method removes the last item from an array and returns a new array.

11/25 Which of the following is used to identify the array?

12/25 Which are closures?

13/25 What will happen if the return statement doesn’t have the associated expression?

14/25 Which method converts a JSON string into a JavaScript object?

15/25 How do you create a Promise in JavaScript?

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

17/25 In JavaScript, what will 'typeof null' return?

18/25 What is the purpose of the 'reduce' method in JavaScript?

19/25 What does 'Event Bubbling' mean in JavaScript?

20/25 What is the use of 'break' in JavaScript?

21/25 What will 'console.log(1 + '2' + '3')' output in JavaScript?

22/25 How do you find the number with the highest value of two numbers in JavaScript?

23/25 What method is used to transform a string into an integer in JavaScript?

24/25 What is the output of 'console.log(0.1 + 0.2 === 0.3)' in JavaScript?

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