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08-08-2008
| #1 (permalink) |
| | How to create a hash table from an array I'm looking for the simplest way to turn an array of custom objects into a hashtable with some particular property of the custom object being the key. So, given some function that emits an array of objects function myArray { 1..10| %{$a=$_;""| select-object name,even,sqr| %{$_.name = "a$a" $_.even = [int]($a/2)*2 -eq $a $_.sqr = $a*$a $_}}} What function f will result in PS 1> $h = f $(myArray) name PS 2> $h.a3.even False |
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08-08-2008
| #2 (permalink) |
| | Re: How to create a hash table from an array function ArrayToHash { Param($array, $indexproperty) $hash = @{} $array | %{$hash[$_.$indexproperty] = $_} $hash } This should turn any enumerable collection into a hash using the named property as an index. For example, you can collect filesystem objects from the current location and use their FullName property as the index like this: ArrayToHash (gci) FullName or, to collect them into a variable: $h = ArrayToHash (gci) FullName "RickB" <rbielaws@xxxxxx> wrote in message news:9853d408-c430-410b-a32c-d34ec51a51cc@xxxxxx Quote: > I'm looking for the simplest way to turn an array of custom objects > into a hashtable with some particular property of the custom object > being the key. > > So, given some function that emits an array of objects > > function myArray { > 1..10| > %{$a=$_;""| > select-object name,even,sqr| > %{$_.name = "a$a" > $_.even = [int]($a/2)*2 -eq $a > $_.sqr = $a*$a > $_}}} > > What function f will result in > > PS 1> $h = f $(myArray) name > PS 2> $h.a3.even > False |
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08-08-2008
| #3 (permalink) |
| | Re: How to create a hash table from an array On Aug 8, 3:44*pm, "Alex K. Angelopoulos" <aka(at)mvps.org> wrote: Quote: > *function ArrayToHash > { > Param($array, $indexproperty) > $hash = @{} > $array | %{$hash[$_.$indexproperty] = $_} > $hash > > } > > This should turn any enumerable collection into a hash using the named > property as an index. For example, you can collect filesystem objects from > the current location and use their FullName property as the index like this: > > ArrayToHash (gci) FullName > > or, to collect them into a variable: > > $h = ArrayToHash (gci) FullName > > "RickB" <rbiel...@xxxxxx> wrote in message > > news:9853d408-c430-410b-a32c-d34ec51a51cc@xxxxxx > > > Quote: > > I'm looking for the simplest way to turn an array of custom objects > > into a hashtable with some particular property of the custom object > > being the key. Quote: > > So, given some function that emits an array of objects Quote: > > function myArray { > > 1..10| > > *%{$a=$_;""| > > *select-object name,even,sqr| > > *%{$_.name = "a$a" > > * *$_.even = [int]($a/2)*2 -eq $a > > * *$_.sqr = $a*$a > > * *$_}}} Quote: > > What function f will result in Quote: > > PS 1> $h = f $(myArray) name > > PS 2> $h.a3.even > > False- Hide quoted text - > - Show quoted text - That was so much help Thanks! |
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