Queue/Definition: Difference between revisions
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empty_ = queue.Count = 0 |
empty_ = queue.Count = 0 |
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End Function</lang> |
End Function</lang> |
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=={{header|VBScript}}== |
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<lang vb>' Queue Definition - VBScript |
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Option Explicit |
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Dim queue, i, x |
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Set queue = CreateObject("System.Collections.ArrayList") |
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If Not empty_(queue) Then Wscript.Echo queue.Count |
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push queue, "Banana" |
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push queue, "Apple" |
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push queue, "Pear" |
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push queue, "Strawberry" |
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Wscript.Echo "Count=" & queue.Count |
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Wscript.Echo pull(queue) & " - Count=" & queue.Count ' |
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Wscript.Echo "Head=" & queue.Item(0) |
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Wscript.Echo "Tail=" & queue.Item(queue.Count-1) |
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Wscript.Echo queue.IndexOf("Pear", 0) |
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For i=1 To queue.Count |
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Wscript.Echo join(queue.ToArray(), ", ") |
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x = pull(queue) |
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Next 'i |
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Sub push(q, what) |
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q.Add what |
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End Sub 'push |
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Function pull(q) |
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Dim what |
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If q.Count > 0 Then |
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what = q(0) |
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q.RemoveAt 0 |
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Else |
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what = "" |
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End If |
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pull = what |
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End Function 'pull |
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Function empty_(q) |
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empty_ = q.Count = 0 |
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End Function 'empty_ |
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</lang> |
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{{out}} |
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<pre> |
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Count=4 |
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Banana - Count=3 |
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Head=Apple |
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Tail=Strawberry |
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1 |
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Apple, Pear, Strawberry |
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Pear, Strawberry |
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Strawberry |
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</pre> |
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=={{header|Wart}}== |
=={{header|Wart}}== |
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Wart defines queues as lists with a pointer to the last element saved for constant-time enqueuing: |
Wart defines queues as lists with a pointer to the last element saved for constant-time enqueuing: |
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