Incorrect information of Data Types/Array Methods about thisArg

還沒有人認領這個 Issue。

I was reading the article on Data Types, Array Methods when I saw the example code for thisArg. The example code below:

The explanation why the code would give a problem if we omit the thisArg argument here is:
>If in the example above we used users.filter(army.canJoin), then army.canJoin would be called as a standalone function, with this=undefined, thus leading to an instant error.

The canJoin isn't called as a standalone function. It's been called in the context of army with the dot syntax. Inside canJoin where we use the 'this' keyword, 'this' points correctly to army. The problem here for some reason is the (implicit in that case as we haven't define it) is the user member of the users array. That's what causes the error and not the omission of the thisArg.

I believe that a whole section about how 'this' works would be highly valuable as it's extremely important to know and often a source of bugs.

從 Data Types/Array Methods 文章開始，找到 issue 中展示的 thisArg 範例。根據範例的行為檢查說明，然後更新措辭以準確解釋問題，並評估是否需要增加一個關於 this 的更廣泛章節。當文章不再將錯誤歸因於錯誤的原因時，即表示完成。

由索引模型根據 Issue 內容生成。