Learn JavaScript from Scratch JavaScript for Everyone - Functions: the DRY (Don't Repeat Yourself) Principle

The video tutorial introduces the DRY (Don't Repeat Yourself) principle, emphasizing the importance of writing code once to avoid redundancy. It uses an example of age-checking logic to illustrate repetitive code. The tutorial then introduces functions as a solution to this problem, explaining their syntax and demonstrating how to implement and use them effectively. Functions allow for code reuse, making it easier to manage and update code without repetition.

What is the main advantage of the DRY principle in coding?

• It makes the code run faster.

• It allows changes to be made in one place and reflect everywhere.

• It reduces the number of lines of code.

• It makes the code more colorful.

In the example given, what is the main issue with checking ages for voting and drinking eligibility?

• The code is written in a different language.

• The same logic is repeated multiple times.

• The code is too short.

• The logic is incorrect.

What is a function in programming?

• A way to store data.

• A method to repeat code multiple times.

• A tool to make code colorful.

• A block of code designed to perform a particular task.

Which keyword is used to define a function in the given example?

• define

• function

• method

• procedure

What is the purpose of the return keyword in a function?

• To output a value from the function.

• To repeat the function.

• To stop the function from executing.

• To start a new function.