104-P-01: Delegates and lambdas

Delegates, what is it?

Lambdas, what is it?

What types of delegates are pre-defined in C#?

• Actions

• Predicates

• Comparisons

• Functions

How to create a lambda that takes 2 arguments?

• (x, y) -> x + y

• (x, y) => x + y

• (x, y) => { x + y; }

• (x, y) => { return x + y; }

Select the correct information about this `Func` delegate

• It returns a char

• It returns an int

• It returns nothing

• It returns a tuple (int, double, string, char)

Answer explanation

It returns a char, because it is the last type specified.

Select the correct information about this `Func` delegate

• It takes 3 parameters

• It takes 4 parameters

• It takes 0 parameter

• It takes only a tuple as parameter

Answer explanation

It returns a char, because it is the last type specified.

Are ACDC greater, lower or equal to YAKA?

• Greater

• Lower

• Equal

Answer explanation

The result of the substraction will be 2. Therefore, the first argument is "greater" than the second using this comparison.

Does this code compile?

• YES!

• NO!

Answer explanation

The `Comparison` takes two arguments, but we can only specify one since this delegate is used to compare two objects of the same type.

Declare a delegate named `MyAwsomeDelegate` that takes an `int` and a `double` and returns nothing.

How many parameters can have a `Func`, at most?

• 16, because why not? 🤔

• There is no limit, because nobody can limit our power! 😈

• 5, it's already enough

• The answer D, always and forever

• 6, for optimization reasons