How can I declare a datatype for an array of objects in Typescript?

Question

I have data that looks like this:

var abc = [{ "id": 1, "name": "x" }, { "id": 2, "name": "x" }]

Can someone tell me how I can declare a datatype for this in Typescript ? Can I go so far as to declare that the objects contain and "id" and "name" field?

You can just declare an interface for things that have an int id and a name string. One of the things TypeScript got right is that it has structural typing. What have you tried so far and where are you stuck? — Benjamin Gruenbaum
– Benjamin Gruenbaum, Commented Jul 27, 2014 at 14:52

Radim Köhler · Accepted Answer · 2014-07-27 14:52:50Z

2

We can use interface defined explicitly or we can just use inline type definition

// inline type 
var abc: {id:number;name:string}[] =
  [{ "id": 1, "name": "x" }, { "id": 2, "name": "x" }]

// wrong
// var abc: {id:number;name:string}[] = [{ x : 1}]


// explicit interface  
interface IData{
    id:number;
    name:string;
}

var def: IData[] =
   [{ "id": 1, "name": "x" }, { "id": 2, "name": "x" }]

// wrong 
// var def: IData[] = [{x : 1 }]

check both here

answered Jul 27, 2014 at 14:52

Radim Köhler

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