The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - Exercise - Write a Function Modifie

The video tutorial guides viewers through creating a function modifier in a contract. It begins with an introduction to the exercise and necessary setup, followed by detailed instructions on creating and implementing a 'costs' modifier. The tutorial emphasizes checking the sender's value against a price requirement. It concludes with final instructions and hints to help viewers complete the exercise, encouraging them to pause and try it themselves before reviewing the solution in the next video.

What is the primary purpose of having the contract register written out before starting the exercise?

• To ensure you have a backup of your work

• To familiarize yourself with the contract structure

• To avoid syntax errors in the code

• To make it easier to copy and paste code

What is the main function of the 'costs' modifier in the exercise?

• To ensure the sender's value is greater than or equal to the price

• To log the transaction details

• To verify the sender's identity

• To check if the sender's value is less than the price

Why is it important for the sender's value to be greater than or equal to the price?

• To prevent insufficient funds for the transaction

• To ensure the transaction is logged

• To verify the sender's identity

• To allow for a refund process

What additional feature should the function modifier have according to the hints provided?

• It should take an argument

• It should log the transaction

• It should verify the sender's identity

• It should calculate the transaction fee

What is the suggested approach before watching the solution in the next video?

• Read the documentation

• Review the previous video

• Try to implement the modifier on your own

• Skip the exercise and watch the solution