{"id":7576,"date":"2020-07-07T14:33:07","date_gmt":"2020-07-07T18:33:07","guid":{"rendered":"https:\/\/jdhitsolutions.com\/blog\/?p=7576"},"modified":"2020-09-30T17:14:20","modified_gmt":"2020-09-30T21:14:20","slug":"answering-the-powershell-word-to-phone-challenge","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/7576\/answering-the-powershell-word-to-phone-challenge\/","title":{"rendered":"Answering the PowerShell Word to Phone Challenge"},"content":{"rendered":"\n

A few weeks ago, the Iron Scripter challenge was to write code to convert a short string into its numeric values<\/a>using the alphabet as it is laid out on a telephone.  A number of solutions have already been shared in the comments on the original post. There are certainly a number of ways to meet the challenge. Here's what I worked out.<\/p>\n\n\n\n

Convert Text to Number<\/h2>\n\n\n\n

I started with a simple hashtable.<\/p>\n\n\n\n

$phone = @{\n    2 = 'abc'\n    3 = 'def'\n    4 = 'ghi'\n    5 = 'jkl'\n    6 = 'mno'\n    7 = 'pqrs'\n    8 = 'tuv'\n    9 = 'wxyz'\n}<\/code><\/pre>\n\n\n\n
The keys, coincidentally named, correspond to the telephone keys on my phone. To convert 'help' means finding the value and its key.<\/p>\n\n\n\n
\"phone1\"<\/figure>\n\n\n\n
The Name property shows me the key.  I can repeat this process for the other letters, join the keys and get my result: 4357. Here's the function I'm using to make this easier and meet some of the challenge's other requirements.<\/p>\n\n\n\n
Function Convert-TextToNumber {\n[cmdletbinding()]\n[Outputtype(\"int32\")]\n\r\n    Param(\r\n        [Parameter(Position = 0, Mandatory, ValueFromPipeline)]\r\n        [ValidatePattern(\"^[A-Za-z]{1,5}$\")]\r\n        [string]$Plaintext,\r\n        [Parameter(HelpMessage = \"A custom dictionary file which is updated everytime a word is converted\")]   \r\n        [string]$Dictionary = \"mywords.txt\"\r\n    )\r\n\r\n    Begin {\r\n        Write-Verbose \"[BEGIN  ] Starting: $($MyInvocation.Mycommand)\"\r\n\r\n        #define a simple hashtable\r\n        $phone = @{\r\n            2 = 'abc'\r\n            3 = 'def'\r\n            4 = 'ghi'\r\n            5 = 'jkl'\r\n            6 = 'mno'\r\n            7 = 'pqrs'\r\n            8 = 'tuv'\r\n            9 = 'wxyz'\r\n        }\r\n\r\n        #initialize a dictionary list\r\n        $dict = [System.Collections.Generic.List[string]]::new()\r\n        if (Test-Path -path $Dictionary) {\r\n            Write-Verbose \"[BEGIN  ] Loading user dictionary from $Dictionary\"            \r\n            (Get-Content -path $Dictionary).foreach({$dict.add($_)})\r\n            $originalCount = $dict.Count\r\n            Write-Verbose \"[BEGIN  ] Loaded $originalCount items\"\r\n        }\r\n    } #begin\r\n    Process {\r\n        Write-Verbose \"[PROCESS] Converting: $Plaintext\"\r\n        #add plaintext to dictionary if missing\r\n        if ($dict -notcontains $Plaintext) {\r\n            Write-Verbose \"[PROCESS] Adding to user dictionary\"\r\n            $dict.Add($plaintext)\r\n        }\r\n\r\n        #this is a technically a one-line expression\r\n        #get the matching key for each value and join together\r\n        ($plaintext.ToCharArray()).ForEach({\r\n         $val = $_ \r\n         ($phone.GetEnumerator().Where({$_.value -match $val}).name)}) -join \"\"\r\n    } #process\r\n\r\n    End {\r\n        #commit dictionary to file if new words were added\r\n        if ($dict.count -gt $originalCount) {\r\n            Write-Verbose \"[END    ] Ending: Saving updated dictionary $Dictionary\"\r\n            $dict | Out-File -FilePath $Dictionary -Encoding ascii -Force\r\n        }\r\n        Write-Verbose \"[END    ] Ending: $($MyInvocation.Mycommand)\"\r\n    } #end\r\n}\r\n    <\/code><\/pre>\n\n\n\n
The function accepts pipelined input of words that are no more than 5 characters long AND can only be alphabet characters, either upper or lower case. That's what I'm doing with the ValidatePattern regular expression.<\/p>\n\n\n\n
I am also planning ahead and keeping a text file of all converted words. If the plaintext doesn't exist in the file, it gets added. If the number of items in the dictionary list changes, I update the file in the End block. Note that I'm using a generic list object and not an array.<\/p>\n\n\n\n
$dict = [System.Collections.Generic.List[string]]::new()<\/code><\/pre>\n\n\n\n
This type of object performs much better than an array. The difference is insignificant in this function, but I am moving more to this model instead of traditional arrays.<\/p>\n\n\n\n
The conversion is done in the Process block with this one-line expression.<\/p>\n\n\n\n
($plaintext.ToCharArray()).ForEach({\n         $val = $_ \n         ($phone.GetEnumerator().Where({$_.value -match $val}).name)}) -join \"\"<\/code><\/pre>\n\n\n\n
Here's a taste of the function in action.<\/p>\n\n\n\n
\"phone2\"<\/figure>\n\n\n\n
Convert Number to Text<\/h2>\n\n\n\n
Converting back is only a little more complex. I can use the same hashtable. This time, I need to get the value associated with each key. I can then build a regular expression pattern to search through my dictionary file. Let me showyou the Verbose output first to illustrate.\"phone3\"<\/p>\n\n\n\n
This word file had everyting I had converted. Here's the same thing using a larger word file.\"phone4\"<\/p>\n\n\n\n
Remember the phrase I converted earlier?\"phone5\"<\/p>\n\n\n\n
It would take a little work but I could probably figure this out. Certainly, a higher quality word file helps. Which is why I started keeping track of what I converted.<\/p>\n\n\n\n
\"phone6\"Here's the complete function.<\/p>\n\n\n\n
Function Convert-NumberToText {\n[cmdletbinding()]\n    Param(\r\n        [Parameter(Position = 0, Mandatory, ValueFromPipeline)]\r\n        [ValidateRange(2, 99999)]\r\n        [int]$NumericValue,\r\n        [Parameter(Mandatory,HelpMessage= \"Specify the path to the word dictionary file.\")]\r\n        [ValidateScript({Test-Path $_})]\r\n        [string]$Dictionary\r\n    )\r\n\r\n    Begin {\r\n        Write-Verbose \"[BEGIN  ] Starting: $($MyInvocation.Mycommand)\"\r\n\r\n        $phone = @{\r\n            2 = 'abc'\r\n            3 = 'def'\r\n            4 = 'ghi'\r\n            5 = 'jkl'\r\n            6 = 'mno'\r\n            7 = 'pqrs'\r\n            8 = 'tuv'\r\n            9 = 'wxyz'\r\n        }\r\n\r\n        Write-Verbose \"[BEGIN  ] Loading a word dictionary from $dictionary\"\r\n        $words = Get-Content -path $Dictionary\r\n\r\n        Write-Verbose \"[BEGIN  ] ...$($words.count) available words.\"\r\n\r\n        #define a regex to divide the numeric value\r\n        [regex]$rx = \"\\d{1}\"\r\n\r\n    } #begin\r\n    Process {\r\n        Write-Verbose \"[PROCESS] Converting: $NumericValue\"\r\n        $Values = ($rx.Matches($NumericValue).value).ForEach({ $val = $_ ; ($phone.GetEnumerator() | Where-Object {$_.name -match $val}).value})\r\n\r\n        Write-Verbose \"[PROCESS] Converting: Possible values: $($Values -join ',')\"\r\n        #build a regex pattern with a word boundary\r\n        $pattern = \"\\b\"\r\n        foreach ($value in $values ) {\r\n            $pattern += \"[$value]{1}\"\r\n        }\r\n        $patternb += \"\\b\"\r\n\r\n        Write-Verbose \"[PROCESS] Using pattern: $pattern\"\r\n        #output will be lower case\r\n        [System.Text.RegularExpressions.Regex]::Matches($words, $pattern, \"IgnoreCase\") |\r\n        Group-Object -Property Value |\r\n        Select-Object -ExpandProperty Name |\r\n        Sort-Object | \r\n        Foreach-Object {$_.tolower()}\r\n\r\n    } #process\r\n\r\n    End {\r\n        Write-Verbose \"[END    ] Ending: $($MyInvocation.Mycommand)\"\r\n    } #end\r\n}\r\n    <\/code><\/pre>\n\n\n\n
And if you want to try my larger word file, download it here<\/a>.<\/p>\n\n\n\n
Learn More<\/h2>\n\n\n\n
There were a number of terrific learning opportunities in this challenge. If you find yourself wanting or needing to learn more, I encourage you to check out the PowerShell content on Pluralsight.com<\/a>. I even have a course on PowerShell and Regular Expressions<\/a>. And to really take your scripting to the next level, grab a copy of The PowerShell Scripting and Toolmaking<\/a> book.<\/p>\n","protected":false},"excerpt":{"rendered":"
A few weeks ago, the Iron Scripter challenge was to write code to convert a short string into its numeric valuesusing the alphabet as it is laid out on a telephone.  A number of solutions have already been shared in the comments on the original post. There are certainly a number of ways to meet…<\/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":"New on the blog: Answering the #PowerShell Word to Phone Challenge","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":[4,8],"tags":[32,618,534,250],"class_list":["post-7576","post","type-post","status-publish","format-standard","hentry","category-powershell","category-scripting","tag-functions","tag-iron-scripter","tag-powershell","tag-regular-expressions"],"yoast_head":"\nAnswering the PowerShell Word to Phone Challenge • 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\/7576\/answering-the-powershell-word-to-phone-challenge\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Answering the PowerShell Word to Phone Challenge • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"A few weeks ago, the Iron Scripter challenge was to write code to convert a short string into its numeric valuesusing the alphabet as it is laid out on a telephone.  A number of solutions have already been shared in the comments on the original post. 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It was terrific to be with passionate PowerShell professionals again. The culmination of the event is the Iron Scripter Challenge. You can learn more about this year's event and winner here. But there is more to the Iron\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":8107,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/8107\/scripting-challenge-meetup\/","url_meta":{"origin":7576,"position":1},"title":"Scripting Challenge Meetup","author":"Jeffery Hicks","date":"February 1, 2021","format":false,"excerpt":"As you probably know, I am the PowerShell problem master behind the challenges from the Iron Scripter site. Solving a PowerShell scripting challenge is a great way to test your skills and expand your knowledge. The final result is merely a means to an end. 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This particular challenge was aimed at beginner\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\/2020\/05\/doublechar.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2020\/05\/doublechar.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2020\/05\/doublechar.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2020\/05\/doublechar.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2020\/05\/doublechar.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2020\/05\/doublechar.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":7559,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/7559\/an-expanded-powershell-scripting-inventory-tool\/","url_meta":{"origin":7576,"position":3},"title":"An Expanded PowerShell Scripting Inventory Tool","author":"Jeffery Hicks","date":"June 19, 2020","format":false,"excerpt":"The other day I shared my code that I worked up to solve an Iron Scripter PowerShell challenge. 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If you aren't familiar with these challenges, and you should be, they are designed to test your PowerShell skills and hopefully help you learn something new. 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