Understanding Objects in JavaScript

Objects are another way to organize / store data , but in a key-value pair format. This makes whatever we store more descriptive , depicting them as properties.

For example,

if we are storing a user, an object tells us exactly what each value represents:

const user = {
    name: "John",
    age: 21
};

In this example, name and age are the keys (or properties), and "John" and 21 are their values. Instead of just having a list of random data, we now have a clear description of the user object.

Accessing the properties -
these properties can be easily accessed through keys

const user = {
    name: "John",
    age: 21
};


// accessing a property 
console,log(user.name) // "John"

console.log(user[name]) 

Updating Properties

Updating is as simple as assigning a new value to the key, just like a variable.

// Update existing property
user.age = 22;

// Add new property
user.city = "New York";

console.log(user); // { name: "John", age: 22, city: "New York" }

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Looping through object keys -

Since objects don't have a .length property like arrays, we have two main ways to loop through them:

Object.keys() (The Array way)

first we get an array of the keys on which we want to iterate using Object.keys() and then we loop through this array.

const keys = Object.keys(user); // ["name", "age", "city"]

keys.forEach(key => {
    console.log(`\({key}: \){user[key]}`);
});

for...in Loop

This is a built-in loop specifically designed for objects. It iterates over every key in the object.

for (let key in user) {
    console.log(`\({key} has a value of \){user[key]}`);
}