Arrays and Objects in JavaScript

Arrays are powerful data structures that allow developers to store and manipulate collections of values in JavaScript. With a plethora of built-in methods and iteration techniques, arrays offer flexibility and efficiency in handling data.

const fruits = [‘apple’, ‘orange’, ‘banana’];

// Adding an element to the end of the array
fruits.push(‘grape’);

// Removing the last element from the array
fruits.pop();

// Checking if an element exists in the array
const isOrangePresent = fruits.includes(‘orange’); // true

const numbers = [1, 2, 3, 4, 5];

// Printing each element using forEach
numbers.forEach((number) => {
console.log(number);
});

Objects in JavaScript are key-value pairs, providing a more complex way to organize data compared to arrays. Unlike arrays, objects have named properties that make accessing and modifying data more intuitive.

const person = {
name: ‘John Doe’,
age: 30,
city: ‘New York’
};

Object properties can hold various data types, including strings, numbers, arrays, or even other objects. Additionally, objects can have methods—functions stored as property values that enable them to perform actions and computations.

const calculator = {
add: function(a, b) {
return a + b;
},
subtract: function(a, b) {
return a – b;
}
};

console.log(calculator.add(5, 3)); // Output: 8
console.log(calculator.subtract(10, 4)); // Output: 6

JSON is a lightweight data-interchange format derived from JavaScript objects. It is widely used for data transfer between server and client and for storing configuration data.

{
“name”: “Alice”,
“age”: 25,
“isStudent”: true
}