Book Image

PowerShell Troubleshooting Guide

By : Mike Shepard
Book Image

PowerShell Troubleshooting Guide

By: Mike Shepard

Overview of this book

Table of Contents (15 chapters)
PowerShell Troubleshooting Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Function output


The example function included in Chapter 1, PowerShell Primer, used string substitution and returned the single result of that operation. As a reminder, here it is again:

function Get-PowerShellVersionMessage{
param($name)
    $PowerShellVersion=$PSVersionTable.PSVersion
    return "We're using $PowerShellVersion, $name!"
}

This pattern (that is, performing a calculation and returning the result) is common to procedural programming languages such as C#, Java, and Visual Basic. In PowerShell, however, functions are more complicated than the usage in this scenario in several ways.

In statically-typed languages, the type of a function (that is, the type of a value returned by the function) is either declared as part of the function definition or inferred by the compiler. In PowerShell, the only consideration of a type associated with the output of a function is in the help provided for the function. This output type can be used by a PowerShell host to guide IntelliSense in the...