OrderBy and sorting in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to sort the list of numbers in ascending order using LINQ.

C Sharp (C#)

var sortedNumbers = numbers.[1](n => n);

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

AOrderBy

BWhere

CSelect

DGroupBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using Where instead of OrderBy will filter elements, not sort them.

Select projects elements but does not sort.

GroupBy groups elements but does not sort.

The OrderBy method sorts elements in ascending order based on the key selector.

2fill in blank

medium

Complete the code to sort the list of strings by their length in descending order.

C Sharp (C#)

var sortedStrings = strings.OrderByDescending(s => s.[1]);

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

ACount

BCapacity

CSize

DLength

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count is for collections, not strings.

Size and Capacity are not valid string properties.

The Length property gives the number of characters in a string, which is used here to sort by string length.

3fill in blank

hard

Fix the error in the code to sort a list of objects by their Age property in ascending order.

C Sharp (C#)

var sortedPeople = people.[1](p => p.Age);

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

AOrderBy

BSort

COrder

DSortBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using Sort is a method on List but not in LINQ.

Order and SortBy are not valid LINQ methods.

The correct LINQ method to sort by a key is OrderBy. Methods like Sort or SortBy do not exist in LINQ.

4fill in blank

hard

Fill both blanks to create a dictionary that maps each word to its length, but only include words longer than 3 characters.

C Sharp (C#)

var wordLengths = words.Where(w => w.[1] > 3).ToDictionary(w => w, w => w.[2]);

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

ALength

BCount

CSize

DCapacity

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count instead of Length for strings.

Using different properties in the two blanks.

The Length property is used to get the number of characters in a string. We use it both to filter words longer than 3 and to get their length for the dictionary values.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values, including only words with length greater than 4.

C Sharp (C#)

var result = words.Where(w => w.[1] > 4).ToDictionary(w => w.[2](), w => w.[3]);

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

ACount

BLength

CToUpper

DToLower

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count instead of Length for strings.

Using ToLower instead of ToUpper for keys.

Mixing properties inconsistently.

We filter words by their Length property, convert them to uppercase with ToUpper() for keys, and use Length again for values.