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This seems really basic, but I can't see how or why it behaves this way:
function ReturnStuff{
$a=1,2,3,4,5
$a.ForEach{
return $_
}
}
ReturnStuff
Why does this give me: 1 2 3 4 5 instead of just 1?
314
The Break statement is used to exit a looping statement such as a Foreach, For, While, or Do loop. When present, the Break statement causes Windows PowerShell to exit the loop. The Break statement can also be used in a Switch statement.
When a break statement appears in a loop, such as a foreach , for , do , or while loop, PowerShell immediately exits the loop. A break statement can include a label that lets you exit embedded loops. A label can specify any loop keyword, such as foreach , for , or while , in a script.
The return keyword exits a function, script, or script block. It can be used to exit a scope at a specific point, to return a value, or to indicate that the end of the scope has been reached.
Because we can return values from a PowerShell function, the value of the return keyword might not immediately be evident. The difference between returning values with Write-Output and the return keyword is using the return keyword exits the current scope.
It looks like you are calling ForEach (a function in [System.Array]) with a parameter which is a scriptblock. Essentially, you are defining and returning { Return $_ } every iteration of the loop.
This means ReturnStuff will capture output each time, and because this function does nothing with the output of this line, all the output is returned:
$a.ForEach{ return $_ }
This behavior is similar to $a | Foreach-Object { return $_ }
So what to do?
Use a ForEach loop instead (not to be confused with Foreach-Object):
ForEach ($item In $a) { return $item }
Select the first value returned from all the scriptblocks:
$a.ForEach{ return $_ } | Select -First 1
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