StringBuilder and why it exists in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new StringBuilder object.

C Sharp (C#)

var sb = new [1]();

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

AStringBuilder

BString

CList

DStringBuilderBuilder

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'String' instead of 'StringBuilder' because strings are immutable.

Trying to use a non-existent class like 'StringBuilderBuilder'.

The StringBuilder class is used to create a mutable string object in C#. You create it by calling new StringBuilder().

2fill in blank

medium

Complete the code to append text to the StringBuilder.

C Sharp (C#)

sb.[1]("Hello");

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

AInsert

BAppend

CAdd

DConcat

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Add' which does not exist for StringBuilder.

Using 'Concat' which is a string method, not StringBuilder.

The Append method adds text to the end of the current StringBuilder content.

3fill in blank

hard

Fix the error in the code to convert StringBuilder to string.

C Sharp (C#)

string result = sb.[1]();

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

AToString

BtoString

CConvert

DStringify

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'toString' which causes a compile error.

Trying to use 'Convert' or 'Stringify' which do not exist.

The correct method to convert a StringBuilder to a string is ToString() with capital 'T' and 'S'.

4fill in blank

hard

Fill both blanks to create a StringBuilder and append text.

C Sharp (C#)

var sb = new [1]();
sb.[2]("World");

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

AStringBuilder

BString

CAppend

DAdd

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'String' instead of 'StringBuilder' for the object.

Using 'Add' instead of 'Append' to add text.

You create a StringBuilder object and then use Append to add text.

5fill in blank

hard

Fill all three blanks to create a StringBuilder, append text, and convert to string.

C Sharp (C#)

var sb = new [1]();
sb.[2]("Hello ");
sb.[3]("World");
string result = sb.ToString();

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

AStringBuilder

BAdd

CAppend

DInsert

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Add' which is not a StringBuilder method.

Using 'Insert' which inserts at a position, not appends.

Create a StringBuilder, then use Append twice to add text pieces.