Recitation

It's a pure function.

• True

• False

It's a pure function.

• True

• False

Is IntTransformer a functional interface?

• True

• False

What is the main defining property of functional interfaces?

• Functional Interfaces are more functional.

• Functional Interfaces have the @FunctionalInterface annotation.

• Functional Interfaces have a single abstract method.

• Functional Interfaces can be implemented using a lambda function.

Which of the following are valid lambda expressions in Java?

• () -> {}

• (x, y) -> x * y

• (String s) -> { int length = s.length(); return length + 1; }

• () -> return 0;

(Self-Quiz) What is the main reason for the compilation error in the line G<A, Integer> g = a::foo;?

• The number of parameters does not match

• Parameter types do not match

• Return value types do not match

How many statements are correct?

a. Lambda expressions are not necessarily lazy.

b. Memoization makes sense when function is deterministic.

• Both statements are incorrect.
• Only the first statement is correct.
• Both statements are correct.
• Only the second statement is correct.