interface User {
id: number;
name?: string;
nickname?: string;
}
interface Info {
id: number;
city?: string;
}
type SuperUser = User & Info;
let su: SuperUser;
su.id = 1;
console.log(su);
I experimented with intersection types in this code. Can you explain why the console is returning 'su' as undefined?
In order to avoid your variable being undefined, it is crucial to initialize it with values as shown below:
type User ={
id: number;
name?: string;
nickname?: string;
}
type Info = {
id: number;
city?: string;
}
type SuperUser = User & Info;
let su:SuperUser = { // <-- First we assign some value
id: 1
};
su.id = 2; // <-- and then we can use or change the value
console.log(su);
You can experiment with this code on the playground
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