JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Iterate Through Objects with the For…in JavaScrip

The video tutorial explains how to use the for...in statement in JavaScript to iterate over objects. Unlike arrays, objects require the for...in loop to access their enumerable properties, including inherited ones. The tutorial provides an example using a video game character object (NPC) with attributes like character type, weapon, and beard. It demonstrates how to log both keys and values using the for...in loop. The lesson concludes with an exercise for further practice.

What is the primary purpose of the 'for...in' statement in JavaScript?

• To iterate over enumerable properties of an object

• To iterate over arrays

• To perform mathematical operations

• To create new objects

Which of the following is NOT a method to loop through objects in JavaScript?

• forEach

• for

• for...in

• map

In the given example, what is the character type of the NPC object?

• Mage

• Archer

• Knight

• Wizard

How can you access the value of a property in an object using the 'for...in' loop?

• By using the object's index

• By using a separate function

• By using the property name directly

• By passing the property key to the object

What is the output order when logging keys and values using 'for...in'?

• Values first, then keys

• Keys first, then values

• Random order

• Alphabetical order