2016 Update

Task/Short-circuit-evaluation/PowerShell/short-circuit-evaluation.psh

@@ -0,0 +1,33 @@
+#  Simulated fast function
+function a ( [boolean]$J ) { return $J }
+
+#  Simulated slow function
+function b ( [boolean]$J ) { Sleep -Seconds 2; return $J }
+
+#  These all short-circuit and do not evaluate the right hand function
+( a $True  ) -or  ( b $False )
+( a $True  ) -or  ( b $True  )
+( a $False ) -and ( b $False )
+( a $False ) -and ( b $True  )
+
+#  Measure of execution time
+Measure-Command {
+( a $True  ) -or  ( b $False )
+( a $True  ) -or  ( b $True  )
+( a $False ) -and ( b $False )
+( a $False ) -and ( b $True  )
+} | Select TotalMilliseconds
+
+#  These all appropriately do evaluate the right hand function
+( a $False ) -or  ( b $False )
+( a $False ) -or  ( b $True  )
+( a $True  ) -and ( b $False )
+( a $True  ) -and ( b $True  )
+
+#  Measure of execution time
+Measure-Command {
+( a $False ) -or  ( b $False )
+( a $False ) -or  ( b $True  )
+( a $True  ) -and ( b $False )
+( a $True  ) -and ( b $True  )
+} | Select TotalMilliseconds