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Introducción

La función es como sub. Pero la función devuelve un valor. Una función puede aceptar parámetros únicos o múltiples.

Definiendo una función

Es realmente fácil definir las funciones. 

Function GetAreaOfARectangle(ByVal Edge1 As Integer, ByVal Edge2 As Integer) As Integer
    Return Edge1 * Edge2
End Function

Dim Area As Integer = GetAreaOfARectangle(5, 8)
Console.Writeline(Area) 'Output: 40

Definiendo una función # 2

Function Age(ByVal YourAge As Integer) As String   
    Select Case YourAge
        Case Is < 18
            Return("You are younger than 18! You are teen!")
        Case 18 to 64
            Return("You are older than 18 but younger than 65! You are adult!")
        Case Is >= 65
            Return("You are older than 65! You are old!")                
    End Select
End Function

Console.WriteLine(Age(48)) 'Output: You are older than 18 but younger than 65! You are adult!


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