Data commit

Task/Inverted-syntax/Wren/inverted-syntax.wren

@@ -0,0 +1,22 @@
+class IBool {
+    construct new(b) {
+        if (!(b is Bool)) Fiber.abort("B must be a boolean")
+        _b = b
+    }
+
+    iff(cond) { cond ? _b : !_b }
+}
+
+var itrue = IBool.new(true)
+
+var needUmbrella
+var raining = true
+
+// normal syntax
+if (raining) needUmbrella = true
+System.print("Is it raining? %(raining). Do I need an umbrella? %(needUmbrella)")
+
+// inverted syntax
+raining = false
+needUmbrella = itrue.iff(raining)
+System.print("Is it raining? %(raining). Do I need an umbrella? %(needUmbrella)")