typescript 打字稿：是否有一种简单的方法可以将一种类型的对象数组转换为另一种类型
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Typescript: Is there a simple way to convert an array of objects of one type to another
提问by Shilpa Nagavara
So, I have two classes
所以，我有两个班级
Item { name: string; desc: string; meta: string}
ViewItem { name: string; desc: string; hidden: boolean; }
I have an array of Item that needs to be converted into an array of ViewItem. Currently, I am looping through the array using for, instantiating ViewItem, assigning values to attributes and pushing it to the second array.
我有一个需要转换为 ViewItem 数组的 Item 数组。目前，我正在使用 for 循环遍历数组，实例化 ViewItem，为属性分配值并将其推送到第二个数组。
Is there a simple way to achieve this using lambda expressions? (similar to C#) Or is there any other means?
有没有一种简单的方法可以使用 lambda 表达式来实现这一点？(类似于C#) 或者还有其他方法吗？
回答by Nitzan Tomer
You haven't showed enough of your code, so I'm not sure how you instantiate your classes, but in any case you can use the array map function:
你没有展示足够的代码，所以我不确定你如何实例化你的类，但在任何情况下你都可以使用数组映射函数：
class Item {
name: string;
desc: string;
meta: string
}
class ViewItem {
name: string;
desc: string;
hidden: boolean;
constructor(item: Item) {
this.name = item.name;
this.desc = item.desc;
this.hidden = false;
}
}
let arr1: Item[];
let arr2 = arr1.map(item => new ViewItem(item));
（操场上的代码）
Edit
编辑
This can be shorter with Object.assign:
这可以更短Object.assign：
constructor(item: Item) {
Object.assign(this, item);
}
回答by cyberpirate92
An alternate method is to use Object.keys,
另一种方法是使用Object.keys，
class Item {
name: string;
desc: string;
meta: string
}
class ViewItem {
name: string;
desc: string;
hidden: boolean;
// additional properties
additionalProp: boolean;
constructor(item: Item) {
Object.keys(item).forEach((prop) => { this[prop] = item[prop]; });
// additional properties specific to this class
this.additionalProp = false;
}
}
Usage:
用法：
let arr1: Item[] = [
{
name: "John Doe",
desc: "blah",
meta: "blah blah"
}
];
let arr2: ViewItem[] = arr1.map(item => new ViewItem(item));
