Modern JavaScript from the Beginning - Second Edition - Prevent Duplicate Items

The video tutorial covers creating a JavaScript function to check if an item exists in local storage, optimizing it to a concise form, and implementing it in a submit logic to prevent duplicate entries. The tutorial also includes testing the functionality and concludes with a summary of learned concepts, such as DOM manipulation, functions, loops, and conditionals. The next video will focus on deploying the project to Netlify.

What method is used to check if an item exists in an array?

• map

• filter

• includes

• find

What should happen if an item already exists when trying to add it again?

• An alert should be shown and the item should not be added.

• The item should be added again.

• The item should be ignored silently.

• The item should be replaced.

Why is it important to distinguish between edit and non-edit modes?

• To automatically update all items.

• To prevent any changes to the items.

• To ensure all items are deleted.

• To allow editing of existing items without restrictions.

Which of the following is NOT a skill highlighted in the project summary?

• Asynchronous programming

• DOM manipulation

• Functions and loops

• Local storage

What is the next step mentioned for the project after the current video?

• Refactoring the code

• Deploying to Netlify

• Adding more features

• Testing the application