Lambda with captures (closures) in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a lambda that adds a captured variable to its input.

C Sharp (C#)

int addValue = 5;
Func<int, int> add = x => x [1] addValue;
int result = add(3);

Drag options to blanks, or click blank then click option'

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to use the captured variable.

The lambda adds the captured variable addValue to the input x using the + operator.

2fill in blank

medium

Complete the code to capture a variable and use it inside the lambda to multiply the input.

C Sharp (C#)

int multiplier = 4;
Func<int, int> multiply = n => n [1] multiplier;
int output = multiply(2);

Drag options to blanks, or click blank then click option'

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or subtraction instead of multiplication.

Not using the captured variable inside the lambda.

The lambda multiplies the input n by the captured variable multiplier using the * operator.

3fill in blank

hard

Fix the error in the lambda expression to correctly capture the variable and add it to the input.

C Sharp (C#)

int offset = 10;
Func<int, int> addOffset = (int x) => x [1] offset;
int result = addOffset(5);

Drag options to blanks, or click blank then click option'

A-

B/

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Syntax errors in the lambda expression.

The lambda should add the captured variable offset to the input x using the + operator.

4fill in blank

hard

Fill the blank to create a lambda that captures a variable and returns true if input is greater than that variable.

C Sharp (C#)

int threshold = 7;
Func<int, bool> isGreater = x => x [1] threshold;
bool check = isGreater(10);

Drag options to blanks, or click blank then click option'

A<

B>

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than or equality operators instead of greater than.

Not using the captured variable in the comparison.

The lambda compares if x is greater than the captured threshold using the > operator.

5fill in blank

hard

Fill all three blanks to create a lambda that captures a string and returns it repeated n times.

C Sharp (C#)

string word = "Hi";
Func<int, string> repeat = n => string.Concat(Enumerable.Repeat([1], [2]));
string result = repeat([3]);

Drag options to blanks, or click blank then click option'

Aword

Bn

C3

D"Hi"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string literal instead of the captured variable.

Mixing up the order of arguments.

Not passing a number for the repeat count.

The lambda uses the captured variable word and repeats it n times. The call uses 3 to repeat it three times.