2016 Update

Task/Ternary-logic/JavaScript/ternary-logic-1.js

@@ -0,0 +1,33 @@
+var L3 = new Object();
+
+L3.not = function(a) {
+  if (typeof a == "boolean") return !a;
+  if (a == undefined) return undefined;
+  throw("Invalid Ternary Expression.");
+}
+
+L3.and = function(a, b) {
+  if (typeof a == "boolean" && typeof b == "boolean") return a && b;
+  if ((a == true && b == undefined) || (a == undefined && b == true)) return undefined;
+  if ((a == false && b == undefined) || (a == undefined && b == false)) return false;
+  if (a == undefined && b == undefined) return undefined;
+  throw("Invalid Ternary Expression.");
+}
+
+L3.or = function(a, b) {
+  if (typeof a == "boolean" && typeof b == "boolean") return a || b;
+  if ((a == true && b == undefined) || (a == undefined && b == true)) return true;
+  if ((a == false && b == undefined) || (a == undefined && b == false)) return undefined;
+  if (a == undefined && b == undefined) return undefined;
+  throw("Invalid Ternary Expression.");
+}
+
+// A -> B is equivalent to -A or B
+L3.ifThen = function(a, b) {
+  return L3.or(L3.not(a), b);
+}
+
+// A <=> B is equivalent to (A -> B) and (B -> A)
+L3.iff = function(a, b) {
+  return L3.and(L3.ifThen(a, b), L3.ifThen(b, a));
+}

Task/Ternary-logic/JavaScript/ternary-logic-2.js

@@ -0,0 +1,10 @@
+L3.not(true)         // false
+L3.not(var a)        // undefined
+
+L3.and(true, a)      // undefined
+
+L3.or(a, 2 == 3)     // false
+
+L3.ifThen(true, a)   // undefined
+
+L3.iff(a, 2 == 2)    // undefined