Make a Typescript object property a generic array of objects?

Question

I'm quite new to using typescript and I'm wanting to make a simple object that holds data relating to a specific users message logs. Here is the basic structure I have at the minute:

export class UserMessageLog {
    date: string;
    askedBy: string;
    msgLogs: { id: string, detail: string }[];

}

When I try to push an object in the format of { id, detail} to the msgLogs property, I get an error in the console stating the msgLogs is undefined. I'm assuming I need to initialize this property in a constructor perhaps? What's the best way to do that?

You can just instantiate it in one line msgLogs: { id: string, detail: string }[] = []; — Roberto Zvjerković
– Roberto Zvjerković, Commented Apr 3, 2019 at 12:06

Murat Karagöz · Accepted Answer · 2019-04-03 12:06:09Z

1

You have to instantiate an array before you can push anything to it. e.g.

const userMessageLog: UserMessageLog = {};
userMessageLog.msgLogs = [];
userMessageLog.msLogs.push(...);

answered Apr 3, 2019 at 12:06

Murat Karagöz

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