Initial data commit

Task/Object-serialization/Wren/object-serialization.wren

@@ -0,0 +1,61 @@
+import "/json" for JSON
+import "io" for File, FileFlags
+
+class Entity {
+    construct new(name) {
+        _name = name
+    }
+
+    name { _name }
+
+    // JSON representation
+    toString { "{\"name\": \"%(_name)\"}" }
+
+    // mimics the JSON output
+    print() { System.print(this.toString.replace("\"", "")) }
+
+    serialize(fileName) {
+        var o = JSON.parse(this.toString)
+        File.openWithFlags(fileName, FileFlags.writeOnly) { |file|
+            file.writeBytes("%(o)\n")
+        }
+    }
+}
+
+class Person is Entity {
+    construct new(name, age) {
+        super(name)
+        _age = age
+    }
+
+    // JSON representation
+    toString { "{\"name\": \"%(name)\", \"age\": \"%(_age)\"}" }
+
+    // mimics the JSON output
+    print() { System.print(this.toString.replace("\"", "")) }
+
+    serialize(fileName) {
+        var o = JSON.parse(this.toString)
+        File.openWithFlags(fileName, FileFlags.writeOnly) { |file|
+            file.writeBytes("%(o)\n")
+        }
+    }
+}
+
+// create file for serialization
+var fileName = "objects.dat"
+var file = File.create(fileName)
+file.close()
+
+System.print("Calling print methods gives:")
+
+var e = Entity.new("John")
+e.print()
+e.serialize(fileName)
+
+var p = Person.new("Fred", 35)
+p.print()
+p.serialize(fileName)
+
+System.print("\nContents of objects.dat are:")
+System.print(File.read(fileName))