Expression-bodied lambdas in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an expression-bodied lambda that adds two numbers.

C Sharp (C#)

Func<int, int, int> add = (x, y) => x [1] y;

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A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '+' will subtract the numbers.

Using '*' or '/' will multiply or divide instead of adding.

The expression-bodied lambda uses the '+' operator to add x and y.

2fill in blank

medium

Complete the code to create an expression-bodied lambda that returns the square of a number.

C Sharp (C#)

Func<int, int> square = x => x [1] x;

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A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' will add the number to itself, not square it.

Using '-' or '/' will not produce the square.

The expression-bodied lambda uses the '*' operator to multiply x by itself, returning the square.

3fill in blank

hard

Fix the error in the expression-bodied lambda that returns true if a number is even.

C Sharp (C#)

Func<int, bool> isEven = x => x [1] 2 == 0;

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A+

B%

C/

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' or '-' will not check for evenness.

Using '/' will give the quotient, not the remainder.

The '%' operator gives the remainder. If x % 2 equals 0, x is even.

4fill in blank

hard

Fill both blanks to create an expression-bodied lambda that returns true if a string is longer than 5 characters.

C Sharp (C#)

Func<string, bool> isLong = s => s.[1] > [2];

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ALength

B5

CCount

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count instead of Length for strings.

Comparing to 10 instead of 5.

The lambda uses the Length property to get the string length and compares it to 5.

5fill in blank

hard

Fill all three blanks to create an expression-bodied lambda that returns a dictionary with keys as uppercase strings and values as their lengths.

C Sharp (C#)

var result = [1].ToDictionary([2] => [2].ToUpper(), [3] => [3].Length);

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

Awords

Bword

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using 'list' instead of the actual collection name.

The lambda uses the list 'words' and the parameter 'word' to create a dictionary with uppercase keys and length values.