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POBest way to add results to an array across multiple functions in Powershell?
 

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  1. POBest way to add results to an array across multiple functions in Powershell?
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    <p>Follow-on question from <a href="https://stackoverflow.com/questions/20520980/powershell-array-scope-why-is-my-array-empty">here</a>. I want to perform a series of checks on some infrastructure, and if the check fails, add it to a list. At the end of the worflow, write the results list. Pseudo code:</p> <pre><code>Function CheckSomething { # perform a check here, if check failed add to the results list } Function CheckSomethingElse { # perform another check, if check failed add to the results list } Function ShowResults { $results; } CheckSomething; CheckSomethingElse; ShowResults; </code></pre> <p>I would like to avoid using global variables, how would you solve it? Use a <code>collections.arraylist</code>?</p> <p><strong>Update</strong> I tried the following suggestion from @mjolinor</p> <pre><code>Function CheckSomething { # perform a check here, if check failed add to the results list $check = $true if ($check -eq $true) {$results[CheckSomething] = 'Pass'} else {$results[CheckSomething] = 'Fail}' } Function CheckSomethingElse { # perform another check, if check failed add to the results list $check = $false if ($check -eq $true) {$results[CheckSomethingElse] = 'Pass'} else {$results[CheckSomethingElse] = 'Fail}' } Function ShowResults { $results; } $results = @{} CheckSomething CheckSomethingElse ShowResults </code></pre> <p>and I get:</p> <pre><code>Missing or invalid array index expression. At C:\Users\moomin\Documents\errorsTest.ps1:5 char:36 + if ($check -eq $true) {$results[ &lt;&lt;&lt;&lt; CheckSomething] = 'Pass'} + CategoryInfo : ParserError: ([:String) [], ParseException + FullyQualifiedErrorId : MissingArrayIndexExpression </code></pre>
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    1. COWhat type of variable you use has no bearing on the use of a global/non-global variable. Some people would say that there is nothing wrong with a global variable or singleton object. A lot of times they would be right. Personally I tend to avoid them because I feel it makes my code more portable. The way to avoid one in your case is to return the failed list as an array and add it to an array that is technically in the global scope but not being directly accessed in the individual functions.
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