[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Set](https://evolu.dev/docs/api-reference/common/Set) › firstInSet

```ts
function firstInSet<T>(set: NonEmptyReadonlySet<T>): T;
```

Defined in: [packages/common/src/Set.ts:246](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Set.ts#L246)

Returns the first element of a non-empty set (by insertion order).

### Example

```ts
firstInSet(new Set(["a", "b", "c"])); // "a"
```