Codebeispiel für das Strategy Pattern als Entwurfsmuster in JavaScript

Author: Sascha-Block

Design Pattern in JavaScript/StrategyPattern.js

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+// Strategy interface
+class FightingStrategy {
+    attack() {}
+}
+
+// Concrete Strategy classes
+class SwordStrategy extends FightingStrategy {
+    attack() {
+        console.log("Elf attacks with a sword!");
+    }
+}
+
+class AxeStrategy extends FightingStrategy {
+    attack() {
+        console.log("Dwarf attacks with an axe!");
+    }
+}
+
+class MagicStrategy extends FightingStrategy {
+    attack() {
+        console.log("Mage attacks with magic!");
+    }
+}
+
+// Context class
+class Character {
+    constructor(strategy) {
+        this.strategy = strategy;
+    }
+
+    setStrategy(strategy) {
+        this.strategy = strategy;
+    }
+
+    attack() {
+        this.strategy.attack();
+    }
+}
+
+// Usage
+const elf = new Character(new SwordStrategy());
+const dwarf = new Character(new AxeStrategy());
+const mage = new Character(new MagicStrategy());
+
+elf.attack(); // outputs "Elf attacks with a sword!"
+dwarf.attack(); // outputs "Dwarf attacks with an axe!"
+mage.attack(); // outputs "Mage attacks with magic!"
+
+elf.setStrategy(new MagicStrategy());
+elf.attack(); // outputs "Mage attacks with magic!"