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Update what-is-typescript.md #211

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- 基于原型的面向对象编程，使得原型上的属性或方法可以在运行时被修改。
- 函数是 JavaScript 中的一等公民<sup>[[2]](#link-2)</sup>，可以赋值给变量，也可以当作参数或返回值。

这种灵活性就像一把双刃剑，一方面使得 JavaScript 蓬勃发展，无所不能，从 2013 年开始就一直蝉联最普遍使用的编程语言排行榜冠军<sup>[[3]](#link-3)</sup>；另一方面也使得它的代码质量参次不起，维护成本高，运行时错误多。
这种灵活性就像一把双刃剑，一方面使得 JavaScript 蓬勃发展，无所不能，从 2013 年开始就一直蝉联最普遍使用的编程语言排行榜冠军<sup>[[3]](#link-3)</sup>；另一方面也使得它的代码质量参差不齐，维护成本高，运行时错误多。

而 TypeScript 的类型系统，在很大程度上弥补了 JavaScript 的缺点。

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