JavaScript is a programming language used to create dynamic content for websites. It is a lightweight, cross-platform, and single-threaded programming language. It's an interpreted language that executes code line by line, providing more flexibility.
JavaScript on Client Side:
On the client side, JavaScript works along with HTML and CSS. HTML adds structure to a web page, CSS styles it, and JavaScript brings it to life by allowing users to interact with elements on the page, such as actions on clicking buttons, filling out forms, and showing animations. JavaScript on the client side is directly executed in the user's browser.
JavaScript on server side:
JavaScript on Server Side: On the Server side (on Web Servers), JavaScript is used to access databases, file handling, and security features to send responses, to browsers.
Types of datatypes
primitive datatypes
| Data Type | Example | Description |
|---|---|---|
| String | "Hello" |
Text inside quotes |
| Number |
42, 3.14
|
Integer or decimal |
| Boolean |
true, false
|
Yes/No, On/Off |
| Undefined | let x; |
Declared but not assigned |
| Null | let x = null; |
Empty or unknown value |
| BigInt | 12345678901234567890n |
Very large numbers |
| Symbol | Symbol("id") |
Unique and immutable value |
Non-primitive
| Data Type | Example | Description |
|---|---|---|
| Object | {name: "Sabitha", age: 22} |
Collection of key-value pairs |
| Array | [1, 2, 3] |
Ordered list of values |
| Function | function() {} |
Block of reusable code |
Arithmetic Operators:
- Operator Description
- + Addition
- - Subtraction
- * Multiplication
- ** Exponentiation (ES2016)
- / Division
- % Modulus (Division Remainder)
- ++ Increment
- -- Decrement
What is an object?
An object in JavaScript is a data structure that allows you to store multiple values in a single variable using key–value pairs.
ATTRIBUTES:
In JavaScript, we can access, change, or remove the attributes of HTML elements using the DOM (Document Object Model).
Attributes are things like: href, src, id, class, value, etc.
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