[英]Typescript: keyof another parameter?
I'm making a function that works with any object like this:我正在制作一个适用于任何对象的函数,如下所示:
function deleteKey (obj, key) {
// This is just for an example, but you will get what kind of typing needed.
delete obj[key];
}
How can I give typing in Typscript correctly?如何正确输入 Typscript? Is there a good way to use
keyof
a parameter like this?有没有像这样使用
keyof
参数的好方法?
function deleteKey (obj: object, key: keyof obj) {
// This is just for an example, but you will get what kind of typing needed.
delete obj[key];
}
Something like this should do the trick:像这样的事情应该可以解决问题:
function deleteKey<T, K extends keyof T>(obj: T, key: K): Omit<T, K> {
delete obj[key];
return obj;
}
interface Foo {
a: string;
b: number;
c: boolean;
}
const foo: Foo = { a: 'test', b: 12, c: true };
const foo_minus_a = deleteKey(foo, 'a');
const foo_minus_b = deleteKey(foo, 'b');
const foo_minus_c = deleteKey(foo, 'c');
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