Table of Contents
JavaScript Syntax
JavaScript syntax is like a set of rules that dictate how you should write JavaScript code so that computers can understand and execute it correctly. Let me give you a quick overview!
1. Variables
- You use var, let, or const to declare variables. For example:
javascript
var x = 5;
let y = 10;
const z = 15;
2. Data Types
- JavaScript has various data types, such as numbers, strings, booleans, objects, arrays, etc.
javascript
var num = 42;
var text = "Hello, World!";
var isTrue = true;3. Operators
- You can perform operations using operators like +, -, *, /, etc.
javascript
var sum = 2 + 3;
var product = 4 * 5;4. Functions
- You define functions using the function keyword.
javascript
function greet(name) {
return "Hello, " + name + "!";
}5. Control Flow
- You use if, else if, and else for conditional statements.
javascript
if (x > 0) {
console.log("Positive number");
} else if (x < 0) {
console.log("Negative number");
} else {
console.log("Zero");
}6. Loops
- For and while loops are used for repetitive tasks.
javascript
for (var i = 0; i < 5; i++) {
console.log(i);
}
var counter = 0;
while (counter < 3) {
console.log("Counting: " + counter);
counter++;
}
7. Objects
- Objects are collections of key-value pairs.
javascript
var person = {
name: "John",
age: 30,
isStudent: false
};8. Arrays
- Arrays store multiple values in a single variable.
javascript
var fruits = ["apple", "banana", "orange"];