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📘 JavaScript Basics Arrays Questions for Beginners: Basics Explained

If you're learning JavaScript, understanding arrays is essential. Arrays allow you to store multiple values in a single variable — making your code cleaner and more powerful. In this post, we'll cover the basics of arrays in JavaScript with simple examples.

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🔹 What is an Array?

An array is a collection of values stored in a single variable.

let fruits = ["apple", "banana", "mango"];

Here, fruits is an array that holds 3 items (or elements).

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🔹 How to Create an Array

You can create arrays in a few ways:

let numbers = [1, 2, 3, 4];        // using square brackets
let emptyArray = [];              // empty array
let mixed = [1, "hello", true];   // mixed data types

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🔹 Accessing Array Elements

Each element in an array has an index, starting from 0.

let colors = ["red", "green", "blue"];
console.log(colors[0]); // red
console.log(colors[2]); // blue

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🔹 Changing Array Elements

You can change an element using its index:

colors[1] = "yellow";
console.log(colors); // ["red", "yellow", "blue"]

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🔹 Common Array Methods

1. push() – Adds an item to the end of the array

colors.push("purple");

2. pop() – Removes the last item

colors.pop();

3. unshift() – Adds an item to the beginning

colors.unshift("pink");

4. shift() – Removes the first item

colors.shift();

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🔹 Checking the Array Length

Use .length to get the number of items in an array:

let numbers = [10, 20, 30];
console.log(numbers.length); // 3

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🔹 Looping Through an Array

You can loop through arrays with a for loop:

for (let i = 0; i < numbers.length; i++) {
  console.log(numbers[i]);
}

Or use .forEach() for cleaner code:

numbers.forEach(function(num) {
  console.log(num);
});

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📌 Summary

✅ Arrays let you store multiple values
✅ You access elements using indexes (starting from 0)
✅ Arrays have many built-in methods like push(), pop(), length, and forEach()
✅ Arrays can hold any type of data: numbers, strings, booleans, or even other arrays