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Pulling items out of an Array

Posted on 2004-10-18
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Last Modified: 2010-04-24
If I have MyArray(100) and wanted to pull out all elements that begin with a particular letter, how would that be done?  
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Question by:Jedidia
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LVL 86

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Mike Tomlinson earned 125 total points
ID: 12340007
Here is one approach:

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private myArray() As String

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ' Put some test data in our array
        Dim temp As String
        temp = "cat,dog,elephant,cougar,crab,bear,fish,camel"
        myArray = Split(temp, ",")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim match As String
        Dim matches As ArrayList = getEntries("c")

        For Each match In matches
            ' do something with each match
            Debug.WriteLine(match)
        Next
    End Sub

    Private Function getEntries(ByVal beginningWith As String) As ArrayList
        Dim entries As ArrayList = New ArrayList
        Dim i As Integer

        For i = 0 To myArray.GetUpperBound(0)
            If myArray(i).StartsWith(beginningWith) Then
                entries.Add(myArray(i))
            End If
        Next i

        Return entries
    End Function

End Class
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LVL 4

Expert Comment

by:gdexter
ID: 12340116
This Function will return an ArrayList containing the elements starting with the searchParam variable

    Private Function GetElements(ByVal searchParam As String) As ArrayList

        Dim i As Integer
        Dim al As New ArrayList

        For i = 0 To MyArray.GetUpperBound(0)
            If (CType(MyArray(i), String).StartsWith(searchParam)) Then
                al.Add(MyArray(i))
            End If
        Next

        Return al
    End Function
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LVL 4

Expert Comment

by:gdexter
ID: 12340131
To late...
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