Immediate execution methods in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to immediately execute the LINQ query and get the count of even numbers.

C Sharp (C#)

int[] numbers = {1, 2, 3, 4, 5};
int evenCount = numbers.Where(n => n % 2 == 0).[1]();

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ASelect

BCount

CWhere

DOrderBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using Select() instead of Count(), which does not return a count.

Using Where() again, which just filters but does not execute.

The Count() method immediately executes the query and returns the number of elements that satisfy the condition.

2fill in blank

medium

Complete the code to immediately execute the LINQ query and convert the result to a list.

C Sharp (C#)

string[] fruits = {"apple", "banana", "cherry"};
var fruitList = fruits.Where(f => f.Contains('a')).[1]();

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AToArray

BOrderBy

CSelect

DToList

Attempts:

3 left

💡 Hint

Common Mistakes

Using ToArray() which returns an array, not a List.

Using Select() which does not execute the query immediately.

The ToList() method immediately executes the query and returns a List containing the filtered elements.

3fill in blank

hard

Fix the error in the code to immediately get the first element that matches the condition.

C Sharp (C#)

List<int> scores = new() { 70, 85, 90 };
int topScore = scores.Where(s => s > 80).[1]();

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AFirst

BFirstOrDefault

CSingle

DLast

Attempts:

3 left

💡 Hint

Common Mistakes

Using Single() which expects exactly one element.

Using Last() which returns the last matching element.

The First() method immediately executes the query and returns the first element that matches the condition. It throws an error if no element is found.

4fill in blank

hard

Fill both blanks to immediately get the maximum score from the list.

C Sharp (C#)

List<int> scores = new() { 55, 78, 92, 88 };
int maxScore = scores.[1](s => s).[2]();

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AMax

BMin

COrderByDescending

DOrderBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using Min() instead of Max().

Using OrderBy() which sorts ascending.

OrderByDescending() sorts the scores from highest to lowest, and Max() returns the maximum value immediately.

5fill in blank

hard

Fill all three blanks to immediately create a dictionary of words and their lengths for words longer than 3 characters.

C Sharp (C#)

string[] words = {"cat", "elephant", "dog", "horse"};
var wordLengths = words.Where(w => w.Length > [1]).ToDictionary([2], [3]);

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A3

Bw

Cw.Length

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using 4 instead of 3 for the length filter.

Using incorrect key or value selectors in ToDictionary().

The code filters words longer than 3 characters, then creates a dictionary with the word as the key and its length as the value.