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Javascript Basics

1/25 Which is the correct way to write a comment in JavaScript?
- {# ... #}
- <!--- .... ---!>
- // ....
- \\ ...
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 Which array method sorts the elements of an array?
- sort()
- changeOrder(order)
- order()
- None of the above metjods
4/25 Which function is used to load the next URL in the history list?
- window.history.next();
- window.history.load_next();
- window.history.forward();
- window.history.load_forward();
5/25 How do you open a confirm window in JavaScript?
- confirm()
- location.confirm()
- window.open_confirm()
- window.new_confirm()
6/25 How do you get cookies in JavaScript?
- window.cookies
- location.cookies
- document.cookie
- document.cookies
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 How do you get the DOM element with id in JavaScript?
- window.getElementById(...)
- document.getElementById(...)
- page.getElementById(...)
- document.innerHTML.getElementById(...)
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 “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”);
11/25 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
12/25 Which of the following is used to identify the array?
- ===
- typeof
- isarrayType()
- ==
13/25 Which of the following is used for assigning a value to a variable?
- *
- =
- -
- x
14/25 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
15/25 Which event occurs when a user clicks on an HTML element in JavaScript?
- onmouseover
- onclick
- onchange
- onhover
16/25 What method is used to round a number to the nearest integer in JavaScript?
- Math.round()
- Math.floor()
- Math.ceil()
- Number.round()
17/25 What will be the output of 'console.log(typeof undefined)'?
- 'undefined'
- 'null'
- 'object'
- 'number'
18/25 Which JavaScript method is used to iterate over all properties of an object?
- Object.forEach()
- for...in
- Object.loop()
- forEach()
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 event loop in JavaScript?
- A loop that handles event listeners
- The mechanism that allows JavaScript to perform non-blocking operations
- A type of for loop
- A method to loop through event properties
21/25 Which method in an array adds new elements to the end of an array?
- push()
- pop()
- shift()
- unshift()
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 Which of the following is a correct method to create a new array?
- var myArray = new Array();
- var myArray = [];
- var myArray = newArray();
- var myArray = Array[];
25/25 Which JavaScript method is used to sort the elements of an array?
- array.sort()
- sort(array)
- array.order()
- order(array)
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