Array.Find on powershell array

Question

How can I use the Array.Find method in powershell?

For example:

$a = 1,2,3,4,5
[Array]::Find($a, { args[0] -eq 3 })

gives

Answer 1

You need to cast the ScriptBlock as a Predicate[T]. Consider the following example:

[Array]::Find(@(1,2,3), [Predicate[int]]{ $args[0] -eq 1 })
# Result: 1

The reason that you received the error, is because there was no matching method overload, in the case where you're passing in a PowerShell ScriptBlock. As you noted in your Get-Member output, there is no Find() method overload that accepts a ScriptBlock as its second parameter.

[Array]::Find(@(1,2,3), { $args[0] -eq 1 })

Cannot find an overload for "Find" and the argument count: "2". At line:1 char:17 + [Array]::Find(@(1,2,3), { $_ -eq 1 }) + ~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodException + FullyQualifiedErrorId : MethodCountCouldNotFindBest