240624

6.4NFE/t.js

@@ -20,10 +20,14 @@ console.log(user.sayBye.name)
 console.log(user.sayHi.name)
 
 function ask(question, ...handlers){
-    let isYes = confirm(question);
+    // let isYes = confirm(question);
+    let isYes;
+    let decision = Math.floor(Math.random() * 2);
+    isYes = decision !== 0;
+    console.log(`isYes? ${isYes}`);
 
     for(let handler of handlers){
-        if (handler.length == 0){
+        if (handler.length === 0){
             if (isYes) handler();
         }else{
             handler(isYes);
@@ -35,10 +39,51 @@ ask("Question?", () => console.log('You said yes'), result => console.log(result
 
 console.log("the difference between the counter.count and closure is the counter.count can be accessed outside but closure cannot");
 
-let sayHi = function func(who){
+sayHi = function func(who){
     console.log(`Hello, ${who}`);
 };
 
 sayHi("John");
 
+function makeCounter(){
+    function counter(){
+        return counter.count++;
+    }
+    counter.set = function setCounter(value){
+        counter.count = value;
+    }
+
+    counter.decrease = function decreaseCounter(){
+        counter.count--;
+    }
+    counter.count = 0
+    return counter;
+}
+
+let counter1 = makeCounter();
+counter1()
+console.log(counter1())
+counter1.set(45)
+console.log(counter1.count)
+counter1.decrease()
+console.log(counter1.count)
+
+function sum(a){
+    let currentSum = a;
+
+    function f(b){
+        currentSum += b;
+        return f
+    }
+
+    f.toString = function(){
+        return currentSum;
+    }
+    return f;
+}
+
+console.log(sum(1)(2));
+console.log(sum(1)(-2));
+alert(sum(1)(2));
+alert(sum(1)(-2));