Data commit

Task/SEDOLs/PowerShell/sedols.psh

@@ -0,0 +1,48 @@
+function Add-SEDOLCheckDigit
+    {
+    Param ( #  Validate input as six-digit SEDOL number
+            [ValidatePattern( "^[0123456789bcdfghjklmnpqrstvwxyz]{6}$" )]
+            [parameter ( Mandatory = $True ) ]
+            [string]
+            $SixDigitSEDOL )
+
+    #  Convert to array of single character strings, using type char as an intermediary
+    $SEDOL = [string[]][char[]]$SixDigitSEDOL
+
+    #  Define place weights
+    $Weight = @( 1, 3, 1, 7, 3, 9 )
+
+    #  Define character values (implicit in 0-based location within string)
+    $Characters = "0123456789abcdefghijklmnopqrstuvwxyz"
+
+    $CheckSum = 0
+
+    #  For each digit, multiply the character value by the weight and add to check sum
+    0..5 | ForEach { $CheckSum += $Characters.IndexOf( $SEDOL[$_].ToLower() ) * $Weight[$_] }
+
+    #  Derive the check digit from the partial check sum
+    $CheckDigit = ( 10 - $CheckSum % 10 ) % 10
+
+    #  Return concatenated result
+    return ( $SixDigitSEDOL + $CheckDigit )
+    }
+
+#  Test
+$List = @(
+    "710889"
+    "B0YBKJ"
+    "406566"
+    "B0YBLH"
+    "228276"
+    "B0YBKL"
+    "557910"
+    "B0YBKR"
+    "585284"
+    "B0YBKT"
+    "B00030"
+    )
+
+ForEach ( $PartialSEDOL in $List )
+    {
+    Add-SEDOLCheckDigit -SixDigitSEDOL $PartialSEDOL
+    }