closes #2244

1-js/09-classes/04-private-protected-properties-methods/article.md

@@ -96,8 +96,9 @@ class CoffeeMachine {
   _waterAmount = 0;
 
   set waterAmount(value) {
-    // "throw new Error" generates an error, we'll cover it later in the tutorial
+    if (value < 0) {
-    if (value < 0) throw new Error("Negative water");
+      value = 0;
+    }
     this._waterAmount = value;
   }
 
@@ -118,7 +119,7 @@ let coffeeMachine = new CoffeeMachine(100);
 coffeeMachine.waterAmount = -10; // Error: Negative water
 ```
 
-Now the access is under control, so setting the water below zero fails.
+Now the access is under control, so setting the water amount below zero becomes impossible.
 
 ## Read-only "power"
 
@@ -160,7 +161,7 @@ class CoffeeMachine {
   _waterAmount = 0;
 
   *!*setWaterAmount(value)*/!* {
-    if (value < 0) throw new Error("Negative water");
+    if (value < 0) value = 0;
     this._waterAmount = value;
   }
 
@@ -200,19 +201,23 @@ class CoffeeMachine {
 */!*
 
 *!*
-  #checkWater(value) {
+  #fixWaterAmount(value) {
-    if (value < 0) throw new Error("Negative water");
+    if (value < 0) return 0;
-    if (value > this.#waterLimit) throw new Error("Too much water");
+    if (value > this.#waterLimit) return this.#waterLimit;
   }
 */!*
 
+  setWaterAmount(value) {
+    this.#waterLimit = this.#fixWaterAmount(value);
+  }
+
 }
 
 let coffeeMachine = new CoffeeMachine();
 
 *!*
 // can't access privates from outside of the class
-coffeeMachine.#checkWater(); // Error
+coffeeMachine.#fixWaterAmount(123); // Error
 coffeeMachine.#waterLimit = 1000; // Error
 */!*
 ```
@@ -233,7 +238,7 @@ class CoffeeMachine {
   }
 
   set waterAmount(value) {
-    if (value < 0) throw new Error("Negative water");
+    if (value < 0) value = 0;
     this.#waterAmount = value;
   }
 }