Javascript 打字稿 hasOwnProperty 等价物
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Typescript hasOwnProperty equivalent
提问by Inn0vative1
In javascript if I want to loop through a dictionary and set properties of another dictionary, I'd use something like this:
在 javascript 中，如果我想遍历一个字典并设置另一个字典的属性，我会使用这样的东西：
for (let key in dict) {
if (obj.hasOwnProperty(key)) {
obj[key] = dict[key];
}
}
If objis a Typescript object (instance of a class), is there a way to perform the same operation?
如果obj是 Typescript 对象（类的实例），有没有办法执行相同的操作？
回答by basarat
If obj is a Typescript object (instance of a class), is there a way to perform the same operation?
如果 obj 是 Typescript 对象（类的实例），有没有办法执行相同的操作？
Your JavaScript is valid TypeScript (more). So you can use the same code as it is.
您的 JavaScript 是有效的 TypeScript（更多）。所以你可以使用相同的代码。
Here is an example:
下面是一个例子：
class Foo{
foo = 123
}
const dict = new Foo();
const obj = {} as Foo;
for (let key in dict) {
if (obj.hasOwnProperty(key)) {
obj[key] = dict[key];
}
}
Note: I would recommend Object.keys(obj).forEach(k=>even for JavaScript but that is not the question you are asking here.
注意：我Object.keys(obj).forEach(k=>什至会推荐JavaScript，但这不是你在这里问的问题。
回答by H Dog
You could probably just use ECMAScript 2015's Object.assign(obj, dict);
您可能只使用 ECMAScript 2015 的 Object.assign(obj, dict);
Typescript spread operatorcomes to mind, but I don't think it's applicable because that's for creating a new object, you want to overwrite properties in an existing class.
我想到了打字稿传播运算符，但我认为它不适用，因为那是为了创建新对象，您想覆盖现有类中的属性。
Things to be aware of is it is only a shallow copy, and it will invoke setters in the target class if they exist.
需要注意的是，它只是一个浅拷贝，如果存在，它将调用目标类中的 setter。
