Home
HTML
HTML Introduction HTML Tags HTML Elements HTML Attributes HTML Heading HTML Paragraph HTML Formatting HTML Quotations HTML Comments HTML Styles HTML Color HTML CSS HTML Images HTML Favicon HTML Links HTML DIV HTML Tables HTML Table Size HTML Table Head Table Padding & Spacing Table colspan rowspsn HTML Table Styling HTML Colgroup HTML List HTML Block & Inline HTML Classes HTML Id HTML Iframes HTML Head HTML Layout HTML Semantic Elements HTML Style Guide HTML Forms HTML Form Attribute HTML Form Element HTML input type HTML Computer code HTML Entity HTML Symbol HTML Emojis HTML Charset HTML Input Form Attribute HTML URL Encoding
CSS
CSS Introduction CSS Syntax CSS Selector How To Add CSS CSS Comments CSS Colors CSS Background color CSS background-image CSS Borders CSS Margins CSS Height, Width and Max-width CSS Box Model CSS Outline CSS Text CSS Fonts CSS Icon CSS Links CSS Tables CSS Display CSS Maximum Width CSS Position z-index Property
JavaScript
What is JavaScript JS Syntax JS Variables JS Data Types JS Operators JS Control Flow - IF JS Control Flow - Switch JS Control Flow - Loop JS Function JS Object Methods JS Anonymous Functions JS Recursive Function JS Default Parameters JS this Keyword
JQuery
What is jQuery? Benefits of using jQuery Include jQuery Selectors. Methods. The $ symbol and shorthand. Selecting elements Getting and setting content Adding and removing elements Modifying CSS and classes Binding and Unbinding events Common events: click, hover, focus, blur, etc Event delegation Using .on() for dynamic content Showing and hiding elements Fading elements in and out Sliding elements up and down .animate() Understanding AJAX .ajax() .load(), .get(), .post() Handling responses and errors. Parent Chlid Siblings Filtering Elements Using find Selecting form elements Getting form values Setting form values Form validation Handling form submissions jQuery plugins Sliders plugins $.each() $.trim() $.extend() Data attributes Debugging jQuery code
Bootstrap 4
What is Bootstrap Benefits of using Setting up Container Row and Column Grid Classes Breakpoints Offsetting Columns Column Ordering Basic Typography Text Alignment Text colors Backgrounds Display Font Size Utilities Buttons Navs and Navbar Forms Cards Alerts Badges Progress Bars Margin Padding Sizing Flexbox Dropdowns Modals Tooltips Popovers Collapse Carousel Images Tables Jumbotron Media Object
Git
Understanding Version Control Download and Install Git Git Configure Git Initialize Add Changes to Staging Commit Changes Branching Merging Remote Repository Understanding Git Conflicts Stashing Changes Viewing Commit History Undoing Changes
PHP
PHP Introduction PHP Installation PHP Syntax PHP Comments PHP Variable PHP Echo PHP Data Types PHP Strings PHP Constant PHP Maths PHP Number PHP Operators PHP if else & if else if PHP Switch PHP Loops PHP Functions PHP Array PHP OOps PHP Class & Object PHP Constructor PHP Destructor PHP Access Modfiers PHP Inheritance PHP Final Keyword PHP Class Constant PHP Abstract Class PHP Superglobals PHP Regular Expression PHP Interfaces PHP Static Method PHP Static Properties PHP Namespace PHP Iterable PHP Form Introduction PHP Form Validation PHP Complete Form PHP Date and Time PHP Include Files PHP - Files & I/O File Upload PHP Cookies PHP SESSION PHP Filters PHP Callback Functions PHP JSON PHP AND Exceptions PHP Connect database
MY SQL
SQL Introduction Syntax Select statement Select Distinct WHERE Clause Order By SQL AND Operator SQL OR Operator SQL NOT Operator SQL LIKE SQL IN SQL BETWEEN SQL INSERT INTO SQL NULL Values SQL UPDATE SQL DELETE SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause SQL MIN() and MAX() Functions SQL COUNT() Function SQL SUM() SQL AVG() SQL Aliases SQL JOIN SQL INNER JOIN SQL LEFT JOIN SQL RIGHT JOIN SQL FULL OUTER JOIN SQL Self Join SQL UNION SQL GROUP BY SQL HAVING SQL EXISTS SQL ANY and ALL SQL SELECT INTO SQL INSERT INTO SELECT SQL CASE SQL NULL Functions SQL Stored Procedures SQL Comments SQL Operators SQL CREATE DATABASE SQL DROP DATABASE SQL BACKUP DATABASE SQL CREATE TABLE SQL DROP TABLE SQL ALTER TABLE SQL Constraints SQL NOT NULL SQL UNIQUE Constraint SQL PRIMARY KEY SQL FOREIGN KEY SQL CHECK Constraint SQL CREATE INDEX SQL AUTO INCREMENT SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types

What is the difference between state and props?

In React.js, both state and props are essential concepts used to manage and pass data within components, but they serve different purposes. Understanding the difference between state and props is fundamental for developing React applications effectively.

State:

Definition:
- State is an internal data storage mechanism in a React component.
- It represents the mutable data that belongs to a component, and it can be changed by the component itself.
Usage:
- State is used to manage data that can change over time within a component.
- When the state of a component changes, React re-renders the component to reflect these changes in the UI.
Setting State:
- State is set using the setState() method provided by React.
Local to Component:
- State is local and specific to the component in which it is declared.
- Changes in the component's state do not affect other components unless passed down as props.

Props:

Definition:
- Props (short for properties) are inputs to a React component.
- They are passed from parent components to child components.
- Props are immutable, meaning they cannot be changed by the component receiving them.
Usage:
- Props allow parent components to pass data and behavior down to their child components.
- Child components receive props as arguments and use them to render their UI or perform actions.
Passing Props:
- Props are passed to a component as attributes in JSX when the component is used.
Read-Only:
- Components that receive props cannot modify them directly.
- Props are read-only within the component that receives them.

Key Differences:

Mutability:
- State is mutable and can be changed by the component itself using setState().
- Props are immutable and cannot be changed by the component receiving them. They are passed from parent to child and remain constant.
Scope:
- State is local to the component where it is declared.
- Props are passed down from parent components to child components, allowing for data flow through the component tree.
Ownership:
- State is owned and managed by the component itself.
- Props are owned by the parent component and are passed down to child components as needed.
Changes:
- When the state of a component changes, React re-renders that component and its children.
- Changes to props from the parent component trigger re-renders in the child component, but the child cannot directly modify those props.

In summary, state is used for managing mutable data within a component, allowing the component to re-render when its state changes. props are used for passing data from parent to child components, providing a way to create reusable and dynamic components in a React application. Understanding when and how to use state and props is crucial for building well-structured and efficient React components.

At Online Learner, we're on a mission to ignite a passion for learning and empower individuals to reach their full potential. Founded by a team of dedicated educators and industry experts, our platform is designed to provide accessible and engaging educational resources for learners of all ages and backgrounds.

Disclaimer About Us