Write a function in TypeScript that takes a number as input and returns its square.

Question

How to correctly declare and initialize a function in TypeScript that takes a number as input and returns its square?

Accepted Answer

```typescript
function square(x: number): number {
 return x * x;
}
```

Answer

```typescript
function square(x): number {
 return x * x;
}
```

Answer

```typescript
function square(x) {
 return x * x;
}
```

Question from the Typescript - Overview test