langs a-z

Task/Exponentiation-operator/PowerShell/exponentiation-operator.psh

@@ -0,0 +1,20 @@
+function pow($a, [int]$b) {
+    if ($b -eq -1) { return 1/$a }
+    if ($b -eq 0)  { return 1 }
+    if ($b -eq 1)  { return $a }
+    if ($b -lt 0) {
+        $rec = $true # reciprocal needed
+        $b = -$b
+    }
+
+    $result = $a
+    2..$b | ForEach-Object {
+        $result *= $a
+    }
+
+    if ($rec) {
+        return 1/$result
+    } else {
+        return $result
+    }
+}