Declaring array of objects in TypeScript? (TS1109: Expression expected)

Question

I am trying to create an array of objects for my project, but during the build, I face this issue:

TS1110: Type expected
TS1109: Expression expected

My array looks like this:

export let COUNTRIES: Array<{ name: string, segments: number[] }> = Array({
   "name":"Afghanistan",
   "segments":[
      4687,
      4787,
      4790,
      4795,
      4880
   ]},{
   "name":"Albania",
   "segments":[
      4136,
      4248
   ]})

I tried this solution from Stack Overflow but to no results.

Tried with an interface, having another issue:

I'm running typescript latest stable version, and the above code works — midugh, May 13 '21 at 22:34
There is only 1 package which I use, it called `@graphprotocol/graph-ts": "0.19.0"`, not sure which version they use. Let me check — , May 13 '21 at 22:37
could try this and see if it works any better. `let COUNTRIES: { name: string, segments: number[] }[] = whatever` — Jacob, May 13 '21 at 22:39

Aadmaa · Answer 1 · 2021-05-14T22:59:25.823

1

I think you might mean this?

interface Country {
    name: string;
    segments: number[];
}

export let COUNTRIES: Country[] = [
    {
    "name":"Afghanistan",
    "segments":[
       4687,
       4787,
       4790,
       4795,
       4880
    ]},{
    "name":"Albania",
    "segments":[
       4136,
       4248
    ]
}]

edited May 14 '21 at 22:59

answered May 13 '21 at 22:43

Aadmaa

829
5
13

Receiving this issue: `TS1003: Identifier expected. name: string,` – May 13 '21 at 23:07
I guess there should be `;` instead of `,` – May 13 '21 at 23:13
Having different issue with this option (check question updated description) – May 13 '21 at 23:24

score 0 · Accepted Answer · answered May 14 '21 at 00:39

0

If someone interested here is the final solution:

export class Country {
  name: string
  segments: number[]
}

export let COUNTRIES: Country[] = [
    {
    "name":"Afghanistan",
    "segments":[
       4687,
       4787,
       4790,
       4795,
       4880
    ]},{
    "name":"Albania",
    "segments":[
       4136,
       4248
    ]
}]

answered May 14 '21 at 00:39

This looks very similar to the answer @Aadmaa provided considering that `class` works fundamentally similarly to `interfaces` – Jacob May 16 '21 at 19:16
1

With interfaces it does not work for this enovirement. Not sure whats the reason – May 16 '21 at 23:10

Declaring array of objects in TypeScript? (TS1109: Expression expected)

2 Answers2