Select clause projection in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to select the names from the list of people.

C Sharp (C#)

var names = people.Select(person => person.[1]);

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

ALength

BAge

CToString()

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Using Age instead of Name will select numbers, not names.

Using ToString() may not return just the name.

The Select clause projects each person to their Name property.

2fill in blank

medium

Complete the code to select the ages from the list of people.

C Sharp (C#)

var ages = people.Select(person => person.[1]);

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

AAge

BName

CHeight

DWeight

Attempts:

3 left

💡 Hint

Common Mistakes

Selecting Name instead of Age will give names, not ages.

Selecting Height or Weight will give unrelated data.

The Select clause projects each person to their Age property.

3fill in blank

hard

Fix the error in the code to select the uppercase names.

C Sharp (C#)

var upperNames = people.Select(person => person.Name.[1]());

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

AToUpper

Btolower

Ctoupper

DUpperCase

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase method names like tolower or toupper causes errors.

UpperCase is not a valid method in C#.

The correct method to convert a string to uppercase in C# is ToUpper().

4fill in blank

hard

Fill both blanks to select the first letter of each person's name and convert it to lowercase.

C Sharp (C#)

var firstLetters = people.Select(person => person.Name[1]0[2].ToString().ToLower());

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

A[

B]

C.

D()

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of brackets causes errors.

Forgetting the closing bracket causes syntax errors.

To get the first letter of a string, use square brackets [] with index 0. Then call ToString() and ToLower() to convert it.

5fill in blank

hard

Fill all three blanks to select a new object with uppercase name and age doubled.

C Sharp (C#)

var result = people.Select(person => new { Name = person.Name.[1](), Age = person.[2] * [3] });

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

AToUpper

BAge

C2

DName

Attempts:

3 left

💡 Hint

Common Mistakes

Using Name instead of Age for multiplication causes errors.

Forgetting parentheses after ToUpper causes errors.

This code creates a new object with the name in uppercase and the age multiplied by 2.