Update "Object methods" files

Author: odsantos

1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md

@@ -14,11 +14,11 @@ let user = makeUser();
 alert( user.ref.name ); // Error: Cannot read property 'name' of undefined
 ```
 
-That's because rules that set `this` do not look at object literals. 
+That's because rules that set `this` do not look at object definition. Only the moment of call matters.
 
-Here the value of `this` inside `makeUser()` is `undefined`, because it is called as a function, not as a method.
+Here the value of `this` inside `makeUser()` is `undefined`, because it is called as a function, not as a method with "dot" syntax.
 
-And the object literal itself has no effect on `this`. The value of `this` is one for the whole function, code blocks and object literals do not affect it.
+The value of `this` is one for the whole function, code blocks and object literals do not affect it.
 
 So `ref: this` actually takes current `this` of the function.
 
@@ -53,5 +53,3 @@ alert( user.ref().name ); // John
 ```
 
 Now it works, because `user.ref()` is a method. And the value of `this` is set to the object before dot `.`.
-
-

1-js/04-object-basics/04-object-methods/7-calculator/task.md

@@ -6,7 +6,7 @@ importance: 5
 
 Create an object `calculator` with three methods:
 
-- `read()` prompts for two values and saves them as object properties.
+- `read()` prompts for two values and saves them as object properties with names `a` and `b` respectively.
 - `sum()` returns the sum of saved values.
 - `mul()` multiplies saved values and returns the result.
 
@@ -21,4 +21,3 @@ alert( calculator.mul() );
 ```
 
 [demo]
-

1-js/04-object-basics/04-object-methods/article.md

@@ -51,7 +51,7 @@ let user = {
 // first, declare
 function sayHi() {
   alert("Hello!");
-};
+}
 
 // then add as a method
 user.sayHi = sayHi;
@@ -90,7 +90,7 @@ user = {
 
 As demonstrated, we can omit `"function"` and just write `sayHi()`.
 
-To tell the truth, the notations are not fully identical. There are subtle differences related to object inheritance (to be covered later), but for now they do not matter. In almost all cases the shorter syntax is preferred.
+To tell the truth, the notations are not fully identical. There are subtle differences related to object inheritance (to be covered later), but for now they do not matter. In almost all cases, the shorter syntax is preferred.
 
 ## "this" in methods