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Test your knowledge of JavaScript, the popular programming language used for web development.
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1
48 random squares
Which company developed JavaScript?
Netscape
Apple
Microsoft
51% got this right
JavaScript was created in 10 days by Brendan Eich in 1995.
2
48 random squares
What is the default value of a variable declared with 'let'?
Undefined
0
NaN
Null
35% got this right
Variables declared with 'let' are initialized with a value of 'undefined' if not assigned a value.
3
48 random squares
Which of these are JavaScript data types?
Boolean
String
Character
Integer
24% got this right
JavaScript has 7 data types: string, number, boolean, null, undefined, object, and symbol.
4
48 random squares
Which method is used to remove the last element of an array?
Pop()
Push()
Shift()
Unshift()
49% got this right
The pop() method removes the last element from an array and returns that element.
5
48 random squares
What does 'DOM' stand for in JavaScript?
Document Object Model
Data Object Model
Display Object Model
Dynamic Object Model
42% got this right
The DOM is a programming interface for HTML and XML documents, representing the structure of a document.
6
48 random squares
Order these JavaScript frameworks/libraries by release date, from oldest to newest.
1.
JQuery
2.
AngularJS
3.
React
4.
Vue.js
84% got this right
jQuery was released in 2006, AngularJS in 2010, React in 2013, and Vue.js in 2014.
7
48 random squares
Which of these is NOT a JavaScript loop?
Repeat
Do-while
For
While
61% got this right
JavaScript has three types of loops: for, while, and do-while. 'repeat' is not a JavaScript loop.
8
48 random squares
What is the purpose of the 'this' keyword in JavaScript?
Refer to the current object
Create a function
Declare a variable
Start a loop
61% got this right
In JavaScript, 'this' is a reference to the object that is executing the current function.
