Design Patterns: Constructor pattern with prototypes

Author: ChauDinh

Design_Patterns/The Constructor Pattern/index.js

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+/**
+ * The Constructor Pattern
+ *
+ * Constructor pattern is used to create specific types of objects.
+ */
+
+//  Basic Constructors
+function Car(model, year, miles) {
+  this.model = model;
+  this.year = year;
+  this.miles = miles;
+
+  this.toString = function () {
+    return this.model + " has done " + this.miles + " miles ";
+  };
+}
+
+var civic = new Car("Honda Civic", 2020, 20000);
+console.log(civic);
+console.log(civic.toString());
+
+// Problems: The simple version of constructor is difficult to make inheritance, other is that functions such as toString() are redefined for each of the new object created using the Car constructor.
+
+// Constructors with prototypes
+function Car2(model, year, miles) {
+  this.model = model;
+  this.year = year;
+  this.miles = miles;
+}
+
+Car2.prototype.toString = function () {
+  return this.model + " has done " + this.miles + " miles ";
+};
+
+var civic2 = new Car2("Honda Civic", 2020, 20000);
+console.log(civic2);
+console.log(civic2.toString());