Facts for Kids
JavaScript is a versatile programming language primarily used for creating interactive and dynamic content on the web.
Overview
Functions And Scope
History Of Java Script
Asynchronous Programming
Data Types And Variables
Basic Syntax And Structure
Object Oriented Java Script
Java Script In Web Development
Modern Java Script Features ES 6
Inside this Article
Mountain View
Information
Technology
Computer
Function
Building
People
Food
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Did you know?
🌐 JavaScript was invented in 1995 by Brendan Eich while working at Netscape.
💻 JavaScript is primarily used for enhancing user interfaces in web development.
⚙️ It supports both functional and object-oriented programming styles.
📜 JavaScript is executed in the browser, making it a client-side language.
📈 JavaScript frameworks like React, Angular, and Vue.js enhance web development.
📅 JavaScript can be used for server-side programming with environments like Node.js.
🛠️ JavaScript has a vast ecosystem of libraries and tools, such as jQuery and D3.js.
🔒 JavaScript has built-in security features like the Same-Origin Policy.
🎮 JavaScript can also be used for game development using libraries like Phaser.
📱 With frameworks like React Native, JavaScript can be used for mobile app development.
Introduction
Functions And Scope
️ We create a function to reuse code without rewriting it every time. For example:
```javascript
function sayHello() {
console.log("Hello!");
}
```
When we call `sayHello()`, the computer runs the code inside the function and says "Hello!" 🎤
Scope tells us where a variable can be used. A local variable can only be used inside the function it was created in. A global variable can be used anywhere in the code. Understanding scope helps us keep our programs organized and prevents confusion! 📚
History Of Javascript
️ Brendan Eich, the creator, made it in just 10 days! Originally, it was called Mocha, then LiveScript, but finally, it got its name JavaScript. 🎉
It was released as a part of Netscape Navigator, a popular web browser at the time. Over the years, JavaScript evolved with new features, and in 1997, it was standardized as ECMAScript. This means that everyone agreed on the rules of how it should work! Now, JavaScript is one of the most widely used programming languages in the world! 🌍
Asynchronous Programming
For example, if you are loading a picture from the internet, that might take a little time. Asynchronous programming allows our code to keep running while it waits!
In JavaScript, we can use something called callbacks or promises to handle this. A callback is like saying, "Hey, once you finish, call me back!" 📞 Here's a simple example:
```javascript
setTimeout(function() {
console.log("Thanks for waiting!");
}, 2000);
```
This code will wait 2 seconds before saying "Thanks for waiting!" It's like cooking a meal and chatting with friends while the food is cooking! 🍽
️
Data Types And Variables
Some common data types are:
1. Numbers: e.g., 7, 3.14
2. Strings: e.g., "apple," "banana"
3. Booleans: e.g., true or false
A variable is like a special box that holds information. You can give it a name, like `myAge`, and store a number inside. Here's how:
```javascript
let myAge = 10;
```
This means that the number 10 is stored in the box named myAge! 🎁
You can change what’s inside the box whenever you want, making it super useful for all kinds of things in our programs! 🔄
Basic Syntax And Structure
For example, we use curly braces {} to group code together, and semicolons (;) to end commands. A simple code looks like this:
```javascript
console.log("Hello, world!");
```
This code tells the computer to show the message "Hello, world!" 🗨️ on the screen. Think of commands in JavaScript like giving instructions to a robot; the clearer you are, the better they understand! Plus, JavaScript is case-sensitive, so "Hello" and "hello" are different! 🎈
Object-oriented Javascript
An object can hold different kinds of information together. For instance, a toy car could have color, speed, and purpose as its properties. Here's an example:
```javascript
let toyCar = {
color: "red",
speed: 100,
drive: function() {
console.log("Vroom Vroom!");
}
};
```
In this example, `toyCar` is an object with properties and a function! 🏎
️ When we call `toyCar.drive()`, it will print "Vroom Vroom!" Objects help us organize our code better and model real-world things! 🎉
Javascript In Web Development
It brings things to life and makes them more engaging for users. When you play an online game or see cool animations on a website, it's often JavaScript at work behind the scenes!
Web developers use JavaScript, along with HTML and CSS, to create everything from interactive maps to online quizzes. 📚
Major websites like YouTube, Facebook, and Twitter all use JavaScript! It's like having a toolbox that helps developers build amazing things online! 🧰
Modern Javascript Features (es6+)
Some of these features make coding easier and more fun! For example, we can use arrow functions to write shorter codes like this:
```javascript
const greet = () => console.log("Hi there!");
```
Another cool feature is let and const, which help us manage our variables better. 🌈
We can also create classes that allow us to build objects in a smoother way!
These modern features keep JavaScript up-to-date and help developers write better code faster! As technology grows, JavaScript becomes more powerful and exciting! 🚀
Javascript Quiz
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