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

```ts
function appendToArray<T>(array: readonly T[], item: T): readonly [T, T];
```

Defined in: [packages/common/src/Array.ts:383](https://github.com/evoluhq/evolu/blob/113517df8a8da4e4eed41363077878e657b22fca/packages/common/src/Array.ts#L383)

Appends an item to an array, returning a new non-empty readonly array.

### Appending a value

```ts
import {
  assertEqual,
  assertType,
  appendToArray,
  type NonEmptyReadonlyArray,
} from "@evolu/common";

const values = appendToArray([1, 2, 3], 4);
assertEqual(values, [1, 2, 3, 4]);
assertType<typeof values, NonEmptyReadonlyArray<number>>();
```