Learn Xojo - 10 Code Examples & CST Typing Practice Test

Xojo is a cross-platform, object-oriented programming environment for developing desktop, web, mobile, and console applications. It features a BASIC-like syntax, drag-and-drop GUI design, and a unified framework for building native applications quickly.

View all 10 Xojo code examples →

Xojo Counter and Theme Toggle Xojo Fibonacci Sequence Xojo Factorial Calculator Xojo Prime Checker Xojo Sum of Array Xojo Reverse String Xojo Multiplication Table Xojo Celsius to Fahrenheit Xojo Simple Alarm Simulation Xojo Random Walk Simulation

Learn XOJO with Real Code Examples

Updated Nov 20, 2025

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Code Sample Descriptions

Xojo Counter and Theme Toggle

Dim count As Integer = 0
Dim isDark As Boolean = False

Sub updateUI()
    System.DebugLog("Counter: " + count.ToString)
    If isDark Then
        System.DebugLog("Theme: Dark")
    Else
        System.DebugLog("Theme: Light")
    End If
End Sub

Sub increment()
    count = count + 1
    updateUI
End Sub

Sub decrement()
    count = count - 1
    updateUI
End Sub

Sub reset()
    count = 0
    updateUI
End Sub

Sub toggleTheme()
    isDark = Not isDark
    updateUI
End Sub

' Simulate actions
updateUI
increment
increment
toggleTheme
decrement
reset

Demonstrates a simple counter with theme toggling using Xojo variables, methods, and event-driven style.

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Xojo Fibonacci Sequence

Dim a As Integer = 0
Dim b As Integer = 1
System.DebugLog(a.ToString)
System.DebugLog(b.ToString)
For i As Integer = 1 To 8
    Dim c As Integer = a + b
    System.DebugLog(c.ToString)
    a = b
    b = c
Next

Generates the first 10 Fibonacci numbers and prints them.

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Xojo Factorial Calculator

Function Fact(n As Integer) As Integer
    If n = 0 Then
        Return 1
    Else
        Return n * Fact(n - 1)
    End If
End Function

System.DebugLog(Fact(5).ToString)

Calculates factorial of a number using recursion.

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Xojo Prime Checker

Function IsPrime(n As Integer) As Boolean
    If n < 2 Then Return False
    For i As Integer = 2 To n - 1
        If n Mod i = 0 Then Return False
    Next
    Return True
End Function

System.DebugLog(If(IsPrime(13), "Prime", "Not Prime"))

Checks if a number is prime.

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Xojo Sum of Array

Dim nums() As Integer = Array(1,2,3,4,5)
Dim sum As Integer = 0
For Each n As Integer In nums
    sum = sum + n
Next
System.DebugLog(sum.ToString)

Calculates sum of an array of numbers.

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Xojo Reverse String

Dim s As String = "HELLO"
Dim r As String = StrReverse(s)
System.DebugLog(r)

Reverses a string.

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Xojo Multiplication Table

Dim n As Integer = 5
For i As Integer = 1 To 10
    System.DebugLog(Str(n) + " x " + Str(i) + " = " + Str(n*i))
Next

Prints multiplication table of a number.

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Xojo Celsius to Fahrenheit

Dim c As Double = 25
Dim f As Double = (c * 9 / 5) + 32
System.DebugLog(f.ToString)

Converts Celsius to Fahrenheit.

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Xojo Simple Alarm Simulation

Dim temp As Integer = 80
Dim thresh As Integer = 75
System.DebugLog(If(temp > thresh, "Alarm: Temperature Too High!", "Temperature Normal"))

Simulates an alarm if a threshold is exceeded.

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Xojo Random Walk Simulation

Dim steps As Integer = 10
Dim pos As Integer = 0
For i As Integer = 1 To steps
    If Rnd() < 0.5 Then
        pos = pos + 1
    Else
        pos = pos - 1
    End If
    System.DebugLog(pos.ToString)
Next

Simulates a 1D random walk.

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Frequently Asked Questions about Xojo

What is Xojo?

What are the primary use cases for Xojo?

Desktop application development (Windows, macOS, Linux). Web application development. iOS mobile apps. Database-driven applications. Prototyping and rapid application development

What are the strengths of Xojo?

Rapid development across multiple platforms. Simplified syntax suitable for beginners. Unified IDE for all platforms. Strong database integration. Active community and extensive documentation

What are the limitations of Xojo?

Limited ecosystem compared to mainstream languages like Java or Python. Not ideal for performance-critical applications. Mobile app support is more restricted than native SDKs. Smaller third-party library ecosystem. Some advanced programming features are limited

How can I practice Xojo typing speed?

CodeSpeedTest offers 10+ real Xojo code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Xojo Counter and Theme Toggle

Dim count As Integer = 0
Dim isDark As Boolean = False

Sub updateUI()
    System.DebugLog("Counter: " + count.ToString)
    If isDark Then
        System.DebugLog("Theme: Dark")
    Else
        System.DebugLog("Theme: Light")
    End If
End Sub

Sub increment()
    count = count + 1
    updateUI
End Sub

Sub decrement()
    count = count - 1
    updateUI
End Sub

Sub reset()
    count = 0
    updateUI
End Sub

Sub toggleTheme()
    isDark = Not isDark
    updateUI
End Sub

' Simulate actions
updateUI
increment
increment
toggleTheme
decrement
reset

Demonstrates a simple counter with theme toggling using Xojo variables, methods, and event-driven style.

Let’s Try →

Xojo Fibonacci Sequence

Dim a As Integer = 0
Dim b As Integer = 1
System.DebugLog(a.ToString)
System.DebugLog(b.ToString)
For i As Integer = 1 To 8
    Dim c As Integer = a + b
    System.DebugLog(c.ToString)
    a = b
    b = c
Next

Generates the first 10 Fibonacci numbers and prints them.

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Xojo Factorial Calculator

Function Fact(n As Integer) As Integer
    If n = 0 Then
        Return 1
    Else
        Return n * Fact(n - 1)
    End If
End Function

System.DebugLog(Fact(5).ToString)

Calculates factorial of a number using recursion.

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Xojo Prime Checker

Function IsPrime(n As Integer) As Boolean
    If n < 2 Then Return False
    For i As Integer = 2 To n - 1
        If n Mod i = 0 Then Return False
    Next
    Return True
End Function

System.DebugLog(If(IsPrime(13), "Prime", "Not Prime"))

Checks if a number is prime.

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Xojo Sum of Array

Dim nums() As Integer = Array(1,2,3,4,5)
Dim sum As Integer = 0
For Each n As Integer In nums
    sum = sum + n
Next
System.DebugLog(sum.ToString)

Calculates sum of an array of numbers.

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Xojo Reverse String

Dim s As String = "HELLO"
Dim r As String = StrReverse(s)
System.DebugLog(r)

Reverses a string.

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Xojo Multiplication Table

Dim n As Integer = 5
For i As Integer = 1 To 10
    System.DebugLog(Str(n) + " x " + Str(i) + " = " + Str(n*i))
Next

Prints multiplication table of a number.

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Xojo Celsius to Fahrenheit

Dim c As Double = 25
Dim f As Double = (c * 9 / 5) + 32
System.DebugLog(f.ToString)

Converts Celsius to Fahrenheit.

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Xojo Simple Alarm Simulation

Dim temp As Integer = 80
Dim thresh As Integer = 75
System.DebugLog(If(temp > thresh, "Alarm: Temperature Too High!", "Temperature Normal"))

Simulates an alarm if a threshold is exceeded.

Let’s Try →

Xojo Random Walk Simulation

Dim steps As Integer = 10
Dim pos As Integer = 0
For i As Integer = 1 To steps
    If Rnd() < 0.5 Then
        pos = pos + 1
    Else
        pos = pos - 1
    End If
    System.DebugLog(pos.ToString)
Next

Simulates a 1D random walk.

Let’s Try →

Frequently Asked Questions about Xojo

What is Xojo?

What are the primary use cases for Xojo?

Desktop application development (Windows, macOS, Linux). Web application development. iOS mobile apps. Database-driven applications. Prototyping and rapid application development

What are the strengths of Xojo?

Rapid development across multiple platforms. Simplified syntax suitable for beginners. Unified IDE for all platforms. Strong database integration. Active community and extensive documentation

What are the limitations of Xojo?

How can I practice Xojo typing speed?

CodeSpeedTest offers 10+ real Xojo code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.