জাভাস্ক্রিপ্ট চিটশিট

<script>
    console.log("হ্যালো, জাভাস্ক্রিপ্ট!");
</script>

<script src="script.js"></script>

// script.js
console.log("এটি এক্সটারনাল JS");

let name = "আনিস";
const age = 25;
console.log(name, age); // আনিস 25

let x = 10; // Number
let y = "টেক্সট"; // String
let z = [1, "দুই", 3]; // Array

let a = 5 + 3; // 8
let b = a === 8; // true
let c = (a > 0 && b); // true

let num = 10;
if (num > 0) {
    console.log("ধনাত্মক");
} else {
    console.log("ঋণাত্মক বা শূন্য");
}

for (let i = 1; i <= 3; i++) {
    console.log(i); // 1, 2, 3
}

function greet(name) {
    return `হ্যালো, ${name}!`;
}
console.log(greet("আনিস")); // হ্যালো, আনিস!

let person = {
    name: "করিম",
    age: 30,
    greet: function() {
        return `হ্যালো, আমি ${this.name}`;
    }
};
console.log(person.name); // করিম
console.log(person.greet()); // হ্যালো, আমি করিম

let numbers = [1, 2, 3];
let doubled = numbers.map(num => num * 2); // [2, 4, 6]

<button id="btn">ক্লিক করুন</button>
<script>
    document.getElementById("btn").addEventListener("click", () => {
        alert("হ্যালো!");
    });
</script>

document.querySelector("p").innerHTML = "নতুন টেক্সট";

function outer() {
    let count = 0;
    return function inner() {
        count++;
        return count;
    };
}
const counter = outer();
console.log(counter()); // 1
console.log(counter()); // 2

const myPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve("সফল!"), 1000);
});
myPromise.then(result => console.log(result)); // সফল!

async function fetchData() {
    let response = await fetch("https://api.example.com");
    let data = await response.json();
    console.log(data);
}
fetchData();

class Person {
    constructor(name) {
        this.name = name;
    }
    greet() {
        return `হ্যালো, ${this.name}`;
    }
}
const p = new Person("আনিস");
console.log(p.greet()); // হ্যালো, আনিস

// math.js
export function add(a, b) {
    return a + b;
}
// main.js
import { add } from './math.js';
console.log(add(2, 3)); // 5

try {
    let x = undefinedVar;
} catch (error) {
    console.log("এরর:", error.message);
} finally {
    console.log("শেষ");
}

<div id="output"></div>
<button id="btn">ক্লিক</button>
<script>
    const output = document.getElementById("output");
    const btn = document.getElementById("btn");
 
    let count = 0;
    btn.addEventListener("click", () => {
        count++;
        output.innerHTML = `ক্লিক সংখ্যা: ${count}`;
    });
</script>