Web Reference: 4 $_ is a variable created by the system usually inside block expressions that are referenced by cmdlets that are used with pipe such as Where-Object and ForEach-Object. But it can be used also in other types of expressions, for example with Select-Object combined with expression properties. Function variable for which the scope ends when function exits. Package body variables defined at the top of package and outside all functions whose scope is the session and visibility is package. Apr 18, 2009 · A variable defined using a var statement is known throughout the function it is defined in, from the start of the function. (*) A variable defined using a let statement is only known in the block it is defined in, from the moment it is defined onward. (**) To understand the difference, consider the following code:
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