List methods (Add, Remove, Find, Sort) in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the Add method do in a List?

The Add method adds a new item to the end of the List. Think of it like putting a new book at the end of a shelf.

beginner

How does the Remove method work in a List?

The Remove method deletes the first occurrence of a specific item from the List. Imagine taking out the first matching book from your shelf.

intermediate

What is the purpose of the Find method in a List?

The Find method searches the List and returns the first item that matches a condition you give. It's like looking for the first red apple in a basket.

beginner

What does the Sort method do in a List?

The Sort method arranges the items in the List in order, usually from smallest to largest or alphabetically. Like organizing books by title on a shelf.

intermediate

How can you use a lambda expression with Find in a List?

You can pass a lambda expression to Find to specify the condition for searching. For example, list.Find(x => x > 10) finds the first number greater than 10.

What happens when you call Remove on a List with an item not present?

A The List is cleared

B Nothing happens, List stays the same

C All items are removed

D An error is thrown

If the item is not found, Remove does nothing and the List remains unchanged.

Which method adds an item to the end of a List?

A Find

B Sort

C Add

D Remove

Add appends a new item to the end of the List.

What does Sort do to a List?

A Arranges items in order

B Deletes all items

C Finds an item

D Adds a new item

Sort arranges the List items in ascending order.

How does Find decide which item to return?

A Returns the last item

B Returns all items

C Returns a random item

D Returns the first item matching a condition

Find returns the first item that matches the condition you provide.

Which of these is a correct way to use Find with a lambda?

A list.Find(x => x == 5)

B list.Find(5)

C list.Find()

D list.Find(x)

You must provide a condition as a lambda expression, like x => x == 5.

Explain how you would add, remove, find, and sort items in a List in C#.

Think about how you manage a collection of things on a shelf.

Describe a real-life example that helps you remember what the List methods Add, Remove, Find, and Sort do.

Imagine managing books or fruits.