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Clarify 'case 2' for 'this' explanation. #2

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kennyklee wants to merge 1 commit into gordonmzhu:master from kennyklee:patch-1

Commits on Nov 25, 2016

Clarify 'case 2' for 'this' explanation.

Here is something I learned today.  See example below.

```
var obj = {
  hello: function() { return "hello, " + this.username; },
  username: "Kenny"
};
obj.hello(); // "hello, Kenny

var obj2 = {
  hello: obj.hello,
  username: "Gordon"
};
obj2. hello(); // "hello, Gordon"
```

Rather than saying 'contains' the method, 'calls' the method seems more accurate.

kennyklee authored Nov 25, 2016