《Learn Windows PowerShell in a Month of Lunches Third Edition》读书笔记—CHAPTER 25 Additional random tips

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25.2 Operators: -as, -is, -replace, -join, -split, -in, -contains

25.2.1 -as and -is

The -as operator produces a new object in an attempt to convert an existing object into a different type.

如果我们有一个数包含小数部分，我们可以通过将该数转化为正数来删除小数部分：
1000 / 3 -as [int]

我们常用的类型有：[string], [xml], [int], [single], [double], [datetime]

is 运算符用来判断一个对象是不是某个类型的，返回True或False

123.45 -is [int]
"SERVER-R2" -is [string]
$True -is [bool]
(Get-Date) -is [datetime]

25.2.2 -replace

-replace 运算符用于在一个字符串中找到所有出现的字符串，并用第三个字符串替换这些出现的字符串

PS C:\> "192.168.34.12" -replace "34","15"
192.168.15.12

25.2.4 -contains and -in

The -contains operator is used to test whether a given object exists within a collection

PS C:\> $collection = 'abc','def','ghi','jkl'
PS C:\> $collection -contains 'abc'
True
PS C:\> $collection -contains 'xyz'
False

The -in operator does the same thing, but it flips the order of the operands so that the collection goes on the right, and the test object on the left:

PS C:\> $collection = 'abc','def','ghi','jkl'
PS C:\> 'abc' -in $collection
True
PS C:\> 'xyz' -in $collection
False

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