September 2017 Update

Task/Enforced-immutability/00DESCRIPTION

@@ -1 +1,3 @@
+;Task:
 Demonstrate any means your language has to prevent the modification of values, or to create objects that cannot be modified after they have been created.
+<br><br>

Task/Enforced-immutability/Kotlin/enforced-immutability.kotlin

@@ -0,0 +1,27 @@
+// version 1.1.0
+
+//  constant top level property
+const val N = 5
+
+//  read-only top level property
+val letters = listOf('A', 'B', 'C', 'D', 'E') // 'listOf' creates here a List<Char) which is immutable
+
+class MyClass {  // MyClass is effectively immutable because it's only property is read-only
+                 // and it is not 'open' so cannot be sub-classed
+    // read-only class property
+    val myInt = 3
+
+    fun myFunc(p: Int) {  // parameter 'p' is read-only
+        var pp = p        // local variable 'pp' is mutable
+        while (pp < N) {  // compiler will change 'N' to 5
+            print(letters[pp++])
+        }
+        println()
+    }
+}
+
+fun main(args: Array<String>) {
+    val mc = MyClass()   // 'mc' cannot be re-assigned a different object
+    println(mc.myInt)
+    mc.myFunc(0)
+}

Task/Enforced-immutability/SuperCollider/enforced-immutability.supercollider

@@ -0,0 +1,5 @@
+// you can freeze any object.
+b = [1, 2, 3];
+b[1] = 100; // returns [1, 100, 3]
+b.freeze; // make b immutable
+b[1] = 2; // throws an error ("Attempted write to immutable object.")

Task/Enforced-immutability/Zkl/enforced-immutability.zkl

@@ -0,0 +1,5 @@
+List(1,2,3).del(0) //--> L(2,3)
+ROList(1,2,3).del(0) //-->SyntaxError : Can't find del, which means you can't call it
+d:=Dictionary(); d.add("one",1)
+D(one:1)
+d.makeReadOnly(); d.add("2",2)  //-->AccessError(This Dictionary is read only)