Why doesn't .indexOf() work?

Question

PowerShell

Hi all!
Faced the following problem.
I have an array of strings and perform the following operations with them, for example:

$arr = @("sometext", "value1","somethingelse")
$temp = $arr -imatch "val"

the value1 gets into the $temp variable, as I want. After that, I try to find this element in the array and find out its index. This is where the problem is, the following commands give me "-1" (which means the element was not found)

$arr.indexOf($temp)
[array]::IndexOf($arr, $temp)

At the same time, both previous commands work out if you manually enter Value1 (well, or something else)
Colleagues, tell me what I'm doing wrong? Thank you!

Answer 1

Comments
This method searches all elements of a one-dimensional arrayfor value. To determine whether value exists in array, the method performs equality comparisons by calling each element's Equals method until it finds a match. This means that if an element overrides Object.Equals(Object) that override's method is called.
PS > $arr[1].Equals($temp)
False
PS > $arr[1].Equals("$temp")
True
Therefore:
PS > $arr.indexOf("$temp")
1
PS > [array] ::IndexOf($arr, "$temp")
1