使用 Scripting.Dictionary 获取唯一值

Dictionary 允许非常简单地获得一组独特的值。考虑以下功能：

Function Unique(values As Variant) As Variant()
    'Put all the values as keys into a dictionary
    Dim dict As New Scripting.Dictionary
    Dim val As Variant
    For Each val In values
        dict(val) = 1 'The value doesn't matter here
    Next
    Unique = dict.Keys
End Function

然后你可以像这样调用：

Dim duplicates() As Variant
duplicates = Array(1, 2, 3, 1, 2, 3)
Dim uniqueVals() As Variant
uniqueVals = Unique(duplicates)

而 uniqueVals 只包含 {1,2,3}。

注意：此函数可与任何可枚举对象一起使用。