[grade-school] exercise can't use Readonly generics

Programming TypeScript
1

I think the right way to make the roster unmodifiable is to use Readonly<> generics. Unfortunately, applying that stops the test from compiling. Not sure how to get around this.

2

Hi there!

Could you post your solution?

You can use triple backticks (```) followed by the word typescript to highlight your code:

```typescript
function hi(): string {
  return 'Hello, World!'
}
```

becomes

function hi(): string {
  return 'Hello, World!'
}
3

Answered on GitHub.