2016 Update

Task/Identity-matrix/PowerShell/identity-matrix-1.psh

@@ -1,21 +1,17 @@
-function id($n) {
-    if($n -gt 0) {
-        $array = @(1..$n | foreach{ @(0) })
-        0..($n-1) | foreach{
-            $i = $_
-            $array[$i] = @(switch(0..($n-1)){
-                $i {1}
-                default {0}
-            })
+function identity($n) {
+    if(0 -lt $n) {
+        $array = @(0) * $n
+        foreach ($i in 0..($n-1)) {
+            $array[$i] = @(0) * $n
+            $array[$i][$i] = 1
         }
         $array
     } else { @() }
 }
 function show($a) {
-    if($a.Count -gt 0) {
-        $n = $a.Count - 1
-        0..$n | foreach{ "$($a[$_][0..$n])" }
+    if($a) {
+        0..($a.Count - 1) | foreach{ if($a[$_]){"$($a[$_])"}else{""} }
     }
 }
-$array = id 4
+$array = identity 4
 show $array