Podcast
Questions and Answers
What is the purpose of the addEventListener method in JavaScript?
What is the purpose of the addEventListener method in JavaScript?
Which of the following is an example of a Complex Data Type in JavaScript?
Which of the following is an example of a Complex Data Type in JavaScript?
What is the purpose of the async/await syntax in JavaScript?
What is the purpose of the async/await syntax in JavaScript?
Which of the following methods is used to select an element in the DOM?
Which of the following methods is used to select an element in the DOM?
Signup and view all the answers
What is the purpose of a constructor function in JavaScript?
What is the purpose of a constructor function in JavaScript?
Signup and view all the answers
What is the name of the tree-like representation of HTML documents in JavaScript?
What is the name of the tree-like representation of HTML documents in JavaScript?
Signup and view all the answers
What is the purpose of the setTimeout method in JavaScript?
What is the purpose of the setTimeout method in JavaScript?
Signup and view all the answers
What is the name of the inheritance model used in JavaScript?
What is the name of the inheritance model used in JavaScript?
Signup and view all the answers
What is the purpose of a callback function in JavaScript?
What is the purpose of a callback function in JavaScript?
Signup and view all the answers
Which of the following is an example of an Arithmetic Operator in JavaScript?
Which of the following is an example of an Arithmetic Operator in JavaScript?
Signup and view all the answers
Study Notes
Syntax
-
Variables: declared using
let,const, orvarkeywords -
Data Types:
- Primitive:
number,string,boolean,null,undefined - Complex:
object,array,function
- Primitive:
-
Operators:
- Arithmetic:
+,-,*,/,%, etc. - Comparison:
===,!==,>,<,>=,<= - Logical:
&&,||,!
- Arithmetic:
-
Control Structures:
- Conditional:
if/else,switch - Loops:
for,while,do...while - Functions:
functionkeyword,=>arrow function
- Conditional:
Event Handling
- Events: user interactions (e.g., clicks, key presses) or browser events (e.g., page load)
- Event Listeners: functions attached to elements to handle events
- addEventListener: method to attach an event listener to an element
-
Event Object: provides information about the event (e.g.,
target,type,timestamp)
Async Programming
- Asynchronous: code that runs concurrently with other tasks
- Callbacks: functions passed as arguments to other functions to handle async results
- Promises: objects that represent async operations and their results
- Async/Await: syntax sugar for working with promises
- ** setTimeout**: method to schedule a function to run after a delay
DOM Manipulation
- Document Object Model (DOM): tree-like representation of HTML documents
- Elements: nodes in the DOM tree
-
Selecting Elements: using
document.getElementById,document.querySelector, etc. -
Creating Elements: using
document.createElement -
Manipulating Elements: using
innerHTML,textContent,appendChild, etc.
Object-oriented Programming
- Objects: collections of key-value pairs
- Properties: key-value pairs within an object
- Methods: functions within an object
- Inheritance: creating new objects based on existing ones
- Prototypal Inheritance: JavaScript's inheritance model
-
Constructor Functions: functions that create objects when called with
newkeyword
Syntax
- Variables are declared using
let,const, orvarkeywords - There are two main categories of data types: primitive and complex
- Primitive data types include
number,string,boolean,null, andundefined - Complex data types include
object,array, andfunction - Arithmetic operators include
+,-,*,/,%, etc. - Comparison operators include
===,!==,>, and<
Event Handling
- Events are user interactions (e.g., clicks, key presses) or browser events (e.g., page load)
- Event listeners are functions attached to elements to handle events
- The
addEventListenermethod is used to attach an event listener to an element - The Event Object provides information about the event, including
target,type, andtimestamp
Async Programming
- Asynchronous code runs concurrently with other tasks
- Callbacks are functions passed as arguments to other functions to handle async results
- Promises are objects that represent async operations and their results
- Async/Await is a syntax sugar for working with promises
- The
setTimeoutmethod is used to schedule a function to run after a delay
DOM Manipulation
- The Document Object Model (DOM) is a tree-like representation of HTML documents
- Elements are nodes in the DOM tree
- Elements can be selected using
document.getElementById,document.querySelector, etc. - New elements can be created using
document.createElement - Elements can be manipulated using
innerHTML,textContent,appendChild, etc.
Object-oriented Programming
- Objects are collections of key-value pairs
- Properties are key-value pairs within an object
- Methods are functions within an object
- Inheritance is the process of creating new objects based on existing ones
- JavaScript uses a prototypal inheritance model
- Constructor functions are functions that create objects when called with the
newkeyword
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of JavaScript basics including variables, data types, operators, and control structures. Evaluate your understanding of syntax and semantics.
