Update topics/about_functions_and_closure

tktan · tktan · commit 956251121987 · 2017-08-08T18:50:58.000+08:00
diff --git a/topics/about_functions_and_closure.js b/topics/about_functions_and_closure.js
@@ -7,14 +7,14 @@ test("defining functions directly", function() {
         result = "b";
     };
     changeResult();
-    equal(__, result, 'what is the value of result?');
+    equal("b", result, 'what is the value of result?');
 });
 
 test("assigning functions to variables", function() {
     var triple = function(input) {
         return input * 3;
     };
-    equal(__, triple(4), 'what is triple 4?');
+    equal(12, triple(4), 'what is triple 4?');
 });
 
 test("self invoking functions", function() {
@@ -23,23 +23,23 @@ test("self invoking functions", function() {
     // self invoking functions are used to provide scoping and to alias variables
     (function(pv) {
         var secretValue = "password";
-        equal(__, pv, 'what is the value of pv?');
-        equal("__", typeof(secretValue), "is secretValue available in this context?");
-        equal("__", typeof(publicValue), "is publicValue available in this context?");
+        equal(publicValue, pv, 'what is the value of pv?');
+        equal("string", typeof(secretValue), "is secretValue available in this context?");
+        equal("string", typeof(publicValue), "is publicValue available in this context?");
     })(publicValue);
 
-    equal("__", typeof(secretValue), "is secretValue available in this context?");
-    equal("__", typeof(publicValue), "is publicValue available in this context?");
+    equal("undefined", typeof(secretValue), "is secretValue available in this context?");
+    equal("string", typeof(publicValue), "is publicValue available in this context?");
 });
 
 test("arguments array", function() {
     var add = function() {
         var total = 0;
         for(var i = 0; i < arguments.length; i++) {
             // complete the implementation of this method so that it returns the sum of its arguments
-            // __
+            total += arguments[i];
         }
-        // __
+        return total;
     };
 
     equal(15, add(1,2,3,4,5), "add 1,2,3,4,5");
@@ -57,7 +57,7 @@ test("using call to invoke function",function(){
     //function, and the arguments to be sent to the function,multiple arguments are separated by commas.
     var result = invokee.call("I am this!", "Where did it come from?");
         
-    equal(__, result, "what will the value of invokee's this be?");
+    equal("I am this!Where did it come from?", result, "what will the value of invokee's this be?");
 });
 
 test("using apply to invoke function",function(){
@@ -70,6 +70,6 @@ test("using apply to invoke function",function(){
     //function and the second is the array of arguments to be passed into the called function.
     var result = invokee.apply("I am this!", ["I am arg1","I am arg2"]);
         
-    equal(__, result, "what will the value of invokee's this be?");
+    equal("I am this!I am arg1I am arg2", result, "what will the value of invokee's this be?");
 });
 
