Return the 'keys' of an array

This example returns a list of the squares of the keys (element positions) of an array.

Code

define squareMe(n::integer) => {  
    return #n * #n
}

var( myNames = array('Tom' , 'Jen' , 'Cam' ))

$myNames->foreachkey => {^  squareMe(#1)+' ' ^}

Result

1 4 9