TypeScript for Beginners - For-In Loop

The video tutorial explains the for-in loop in JavaScript, which is used to iterate over the properties of an object. It demonstrates the syntax and application of the for-in loop using a student object example. The tutorial also covers how to access both the keys and values of an object's properties using this loop. The session concludes with a recap of the syntax and its practical use.

What is the primary use of a for-in loop?

• To handle asynchronous operations

• To execute a block of code a specific number of times

• To iterate over the properties of an object

• To iterate over arrays

In the example with the student object, what does the for-in loop iterate over?

• The length of the object

• The properties of the object

• The methods of the object

• The values of the object

What will be logged to the console if the student object has properties 'name' and 'score'?

• The length of the student object

• The keys 'name' and 'score'

• An error message

• The values of 'name' and 'score'

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

• Using dot notation

• Using the length property

• Using a for-of loop

• Using square bracket notation with the property name

What keyword is used in the syntax of a for-in loop?

• forEach

• in

• of

• with