打字稿：推送不适用于自定义类型的数组 [英] Typescript: push not available on custom typed array

问题描述

将Javascript与Typescript一起使用（v1.4.1）我有一个自定义类型如下：

Using Javascript with Typescript (v1.4.1) I have a custom type as follows:

interface WordDataForQuestion {
    question : {
        id : number;
        vocab : string;
        comment : string;
    };
    possibleAnswers : {
        [index : number] : {
            id : number;
            vocab : string;
            comment : string;
        }
    };
}

现在我要推送数组中的元素 possibleAnswers

Now I want to push an element in the array possibleAnswers

nextWordData.possibleAnswers.push(
    {
        id : vocabs[index].id,
        vocab : vocabs[index].voc_t,
        comment : vocabs[index].com_t
    }
);

但它给我以下错误：

exercise.ts(69,42): error TS2339: Property 'push' does not exist on type '{ [index: number]: { id: number; vocab: string; comment: string; }; }'.

我不明白有什么不对 - possibleAnswers 应该是一个支持push-operation的JavaScript数组。我不对吗？

I don't understand what is wrong - possibleAnswers should be a JavaScript array here which supports the push-operation. Am I not right?

推荐答案

你几乎就在那里。您确实将其定义为具有索引器的对象。不作为数组，请参阅下面的示例

You are almost there. You did define it as an object with an indexer. Not as an array, see example below

possibleAnswers : {
        id : number;
        vocab : string;
        comment : string;
}[];

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