{"id":2720,"date":"2013-01-19T11:00:33","date_gmt":"2013-01-19T16:00:33","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=2720"},"modified":"2013-01-21T08:34:30","modified_gmt":"2013-01-21T13:34:30","slug":"silly-saturday-powershell-palindromes","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2720\/silly-saturday-powershell-palindromes\/","title":{"rendered":"Silly Saturday PowerShell Palindromes"},"content":{"rendered":"

\"242px-Sator_Square_at_Opp\u00e8de\"<\/a>Normally I post amusing PowerShell-related content on Fridays as part of my Friday Fun series. These are light-hearted articles about using PowerShell. Almost always they are not practical but they serve as a learning vehicle. My topic this week seems extra silly so I'm moving it to Saturday. I'm a pushover for alliteration.<\/p>\n

Last week I came across a comment on Facebook that involved palindromes. A palindrome is a word that is spelled the same backwards and forwards. Names like Otto and ABBA are palindromes. So are words like madam, civic, and redder. I thought it would be fun to use PowerShell to test if a string was a palindrome. To figure this out I would need to find the midpoint of the string, get the first part of the string and then compare it to the last part of the string, but in reverse order.<\/p>\n


\nPS C:\\> $t = \"madam\"
\nPS C:\\> $mid=[math]::Truncate($t.length\/2)
\nPS C:\\> $mid
\n2
\n<\/code><\/p>\n

I'm using the Truncate method from the [Math] class so that when I divide the string length by 2, the value is rounded down. This will be important in a moment. Getting the first half of the string is pretty simple.<\/p>\n


\nPS C:\\> $start = -join ($t[0..($mid-1)])
\nPS C:\\> $start
\nma
\n<\/code><\/p>\n

I'm getting characters in $t by their index number. In this case going from 0 to the midpoint minus 1. This would give me an array of characters so I regroup them using the -join operator. As an alternative, I could also have done this:<\/p>\n


\nPS C:\\> $start = $t.Substring(0,($mid))
\n<\/code><\/p>\n

Now to get the last half. Remember, I need to get the end of the string in reverse order until I reach the midpoint again. I can use the same technique I used for the front, except this time starting at the end and going backwards.<\/p>\n


\nPS C:\\> $end = -join ($t[-1..-($mid)])
\nPS C:\\> $end
\nma
\n<\/code><\/p>\n

Now to compare $start and $end.<\/p>\n


\nPS C:\\> $start -eq $end
\nTrue
\n<\/code><\/p>\n

You may be wondering, \"What about the 'd'?\" Well, in this case it is irrelevant because going backwards or forwards the 'd' is in the same place. I think of these as pivot letters. But this technique also works for strings without a pivot point.<\/p>\n


\nPS C:\\> $t=\"redder\"
\nPS C:\\> $mid=[math]::Truncate($t.length\/2)
\nPS C:\\> $start = -join ($t[0..($mid-1)])
\nPS C:\\> $end = -join ($t[-1..-($mid)])
\nPS C:\\> $start -eq $end
\nTrue
\nPS C:\\> $start
\nred
\nPS C:\\> $end
\nred
\nPS C:\\>
\n<\/code><\/p>\n

So how about a simple function to test if a string is a palindrome?<\/p>\n


\nFunction Test-IsPalindrome {
\n[cmdletbinding()]
\nParam(
\n[Parameter(Position=0,Mandatory=$True,ValueFromPipeline=$True)]
\n[ValidateNotNullorEmpty()]
\n[string]$Text,
\n[switch]$IgnoreSpace
\n)<\/p>\n

Process {
\n Write-Verbose \"Testing $Text\"
\n if ($IgnoreSpace) {
\n Write-Verbose \"Removing spaces from text\"
\n $text = $text.Replace(\" \",\"\")
\n Write-Verbose $text
\n }
\n $l = $text.length
\n Write-Verbose \"Length is $l\"
\n $mid = [math]::Truncate($l\/2)
\n Write-Verbose \"Midpoint is $mid\"<\/p>\n

#could also use Substring()
\n $start = -join ($text[0..($mid-1)]) #$text.Substring(0,($mid))
\n $end = -join ($text[-1..-($mid)])
\n Write-Verbose \"Start: $start\"
\n Write-Verbose \"Pivot: $($Text[$mid])\"
\n Write-Verbose \"End : $end\"
\n if ($start -eq $end) {
\n $True
\n }
\n else {
\n $false
\n }<\/p>\n

} #process
\n} #end Test-IsPalindrome
\n<\/code><\/p>\n

This is an advanced function so I could add some verbose messages, which is great for troubleshooting and debugging. I also wanted to be able to pipe strings to the function. The intent is to test a string and return True or False. The code is essentially the same thing I showed you, except now it is a little easier to use. <\/p>\n


\nPS C:\\> \"redder\",\"foo\",\"civic\",\"madam\" | Test-IsPalindrome <\/p>\n

True
\nFalse
\nTrue
\nTrue
\n<\/code><\/p>\n

I added an extra feature to strip out spaces.<\/p>\n


\nPS C:\\> Test-IsPalindrome \"Madam Im Adam\" -IgnoreSpace -Verbose
\nVERBOSE: Testing Madam Im Adam
\nVERBOSE: Removing spaces from text
\nVERBOSE: MadamImAdam
\nVERBOSE: Length is 11
\nVERBOSE: Midpoint is 5
\nVERBOSE: Start: Madam
\nVERBOSE: Pivot: I
\nVERBOSE: End : madAm
\nTrue
\nPS C:\\> Test-IsPalindrome \"A nut for a jar of tuna\" -IgnoreSpace
\nTrue
\n<\/code><\/p>\n

Yes, this is a silly application of PowerShell. But I hope it gives you an idea of how to use the -Join operator and to work with strings. By the way, I could use these techniques to turn a string into a palindrome.<\/p>\n


\nPS C:\\> $text=\"sum\"
\nPS C:\\> -join ($Text, -join $Text[-1..-($Text.length)])
\nsummus
\n<\/code><\/p>\n

Ok, perhaps not a valid word in English but see if you can follow what the -Join operators are doing and how this snippet works. If you'd like to play with this, you can download Test-IsPalindrome<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Normally I post amusing PowerShell-related content on Fridays as part of my Friday Fun series. These are light-hearted articles about using PowerShell. Almost always they are not practical but they serve as a learning vehicle. My topic this week seems extra silly so I’m moving it to Saturday. I’m a pushover for alliteration. Last week…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[396,414,534,243],"class_list":["post-2720","post","type-post","status-publish","format-standard","hentry","category-powershell","tag-join","tag-operators","tag-powershell","tag-string"],"yoast_head":"\nSilly Saturday PowerShell Palindromes • The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/powershell\/2720\/silly-saturday-powershell-palindromes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Silly Saturday PowerShell Palindromes • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"Normally I post amusing PowerShell-related content on Fridays as part of my Friday Fun series. 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I can't say you'll find any deep, meaningful, production use from today's post, but you might pick up a few techniques, which is really the point. Today we're going to have some fun\u2026","rel":"","context":"In "Friday Fun"","block_context":{"text":"Friday Fun","link":"https:\/\/jdhitsolutions.com\/blog\/category\/friday-fun\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1389,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/1389\/friday-fun-randomness-abounds\/","url_meta":{"origin":2720,"position":4},"title":"Friday Fun Randomness Abounds","author":"Jeffery Hicks","date":"April 29, 2011","format":false,"excerpt":"I find it a little ironic that although I like efficiency, structure and order I'm fascinated with randomness. In today's Friday Fun I want to explore a few ways you might incorporate randomness into your PowerShell scripting. Perhaps you need a random number between 100 and 500. Or a string\u2026","rel":"","context":"In "Friday Fun"","block_context":{"text":"Friday Fun","link":"https:\/\/jdhitsolutions.com\/blog\/category\/friday-fun\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2098,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2098\/valentines-day-powershell-fun\/","url_meta":{"origin":2720,"position":5},"title":"Valentines Day PowerShell Fun","author":"Jeffery Hicks","date":"February 14, 2012","format":false,"excerpt":"In case you missed some of the fun on Twitter and Google Plus, here are the PowerShell valentines I sent today. These are intended to be run from the PowerShell console, not the ISE. Also, depending on your console font, you might get slightly different results. I use Lucida Console.\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2012\/02\/psvalentine.png?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/2720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/comments?post=2720"}],"version-history":[{"count":0,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/posts\/2720\/revisions"}],"wp:attachment":[{"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/media?parent=2720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/categories?post=2720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jdhitsolutions.com\/blog\/wp-json\/wp\/v2\/tags?post=2720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}