[英]Unable to use indexOf on a Typed Array due to TypeScript error
I have defined an Interface
, created an array of type Interface
and am now attempting to use .indexOf
, a method of an Array, and I am getting IDE error complaints that make no sense to me. 我已经定义了一个
Interface
,创建了一个type Interface
的数组,现在我正在尝试使用.indexOf
,一个Array的方法,我收到的IDE错误投诉对我来说毫无意义。 Hoping someone here may be able to lend a thought to solve this pickle. 希望有人在这里可以考虑解决这个问题。
export interface IAddress {
name: string,
registrationId: number
}
let friends: IAddress[];
// assume friends has a few elements...
let index = friends.indexOf((friend: IAddress) => {
return !!(friend.name === 'some name');
});
Argument of type '(friend: IAddress) => boolean' is not assignable to parameter of type 'IAddress'.
Type '(friend: IAddress) => boolean' is missing the following properties from type 'IAddress': registrationId
If I were to remove the :IAddress
from the typed def next to friend:
I see this error instead. 如果我要从
friend:
旁边的类型def中删除:IAddress
friend:
我看到了这个错误。
Argument of type '(friend: any) => boolean' is not assignable to parameter of type 'IAddress'.
Type '(friend: any) => boolean' is missing the following properties from type 'IAddress': registrationId
Array.prototype.indexOf()
receives a parameter searchElement
and a second optional parameter fromIndex
. Array.prototype.indexOf()
接收参数searchElement
和第二个可选参数fromIndex
。
Updated answer based on @Pixxl comment to use Array.prototype. 基于@Pixxl注释更新了答案以使用Array.prototype。 findIndex() to get
index
variable: findIndex()获取
index
变量:
const friends: IAddress[];
// assume friends has a few elements...
const index = friends.findIndex((friend: IAddress) => friend.name === 'some name');
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