Var for variables (mutable) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a mutable variable named age with value 25.

Swift

var [1] = 25

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

Aage

Blet

Cconstant

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'let' instead of a variable name after 'var'.

Using a reserved keyword as the variable name.

In Swift, var declares a mutable variable. Here, age is the variable name.

2fill in blank

medium

Complete the code to change the value of the variable score to 100.

Swift

score [1] 100

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

Alet

B=

Cvar

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which is a comparison operator.

Using 'let' or 'var' which are for declarations.

The = operator assigns a new value to a variable.

3fill in blank

hard

Fix the error in the code to declare a mutable variable name with value "Alice".

Swift

[1] name = "Alice"

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

Avar

Bvariable

Clet

Dconst

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'let' which declares a constant.

Using 'const' which is not a Swift keyword.

Use var to declare a mutable variable in Swift.

4fill in blank

hard

Fill both blanks to declare a mutable variable temperature with value 72.

Swift

[1] [2] = 72

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

Avar

Blet

Ctemperature

Dtemp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'let' instead of 'var' for mutable variables.

Using a variable name that does not match the instruction.

var declares a mutable variable, and temperature is the variable name.

5fill in blank

hard

Fill all three blanks to declare a mutable variable count, assign 10, and then update it to 15.

Swift

[1] [2] = 10
[3] = 15

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

Avar

Bcount

Dlet

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'let' to declare a variable that is later changed.

Using different names for the variable in declaration and update.

First, var declares the variable, then count is the name. Later, count is updated to 15.