commit

Author: Vitalii Telychko

index.html

@@ -10,6 +10,6 @@
 
 <div id="content"></div>
 
-<script src="ES6/Array_features/methods.js"></script>
+<script src="programming_paradigms/functional_programming/shared_state.js"></script>
 </body>
 </html>

programming_paradigms/functional_programming/shared_state.js

@@ -0,0 +1,24 @@
+// const x = {
+//   val: 2
+// };
+//
+// // Mutates shared state
+// const x1 = () => x.val += 1;
+// // Mutates shared state
+// const x2 = () => x.val *= 2;
+//
+// // if reverse invocations => result changed
+// x2();
+// x1();
+//
+// console.log(x.val);
+
+// Immutable state
+// const x = {
+//   val: 2
+// };
+//
+// const inc = x => ({ ...x, val: x.val + 1 });
+// const double = x => ({ ...x, val: x.val * 2 });
+//
+// console.log(double(inc(x)).val);