Object iteration means looping through an object's properties to access its keys and values.

1. Example object

const product = { brand: "Samsung", price: 25000, model: "Galaxy M", color: "Black" };

This object contains four properties: brand, price, model, and color

2. for...in loop
The for...in loop iterates over an object's enumerable property keys.

const product = { brand: "Samsung", price: 25000, model: "Galaxy M" }; for (let key in product) { console.log(key); }

Output:

brand price model

To get both the key and its value:

for (let key in product) { console.log(key, ":", product[key]); }

Output :

brand : Samsung price : 25000 model : Galaxy M

Remember: Use product[key] to access a property's value dynamically.
3. Object.keys()
Returns an array of the object's property names.

const product = { brand: "Samsung", price: 25000, model: "Galaxy M" }; console.log(Object.keys(product));

Output:

["brand", "price", "model"]

Loop through the keys:

Object.keys(product).forEach(key => { console.log(key); });

4. Object.values()
Returns an array of the object's property values.

console.log(Object.values(product));

Output:

["Samsung", 25000, "Galaxy M"]

Loop through the values:

Object.values(product).forEach(value => { console.log(value); });

5. Object.entries()
Returns an array of key-value pairs. This is useful when you need both.

console.log(Object.entries(product)); 
Output: [ ["brand", "Samsung"], ["price", 25000], ["model", "Galaxy M"] ]

Using forEach():

Object.entries(product).forEach(([key, value]) => { console.log(key, ":", value); });

Output :

brand : Samsung price : 25000 model : Galaxy M