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

```ts
function createEqObject<A>(eqs: {
  [K in string | number | symbol]: Eq<A[K]>;
}): Eq<{ readonly [K in string | number | symbol]: A[K] }>;
```

Defined in: [packages/common/src/Eq.ts:107](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Eq.ts#L107)

Creates an equivalence function for objects based on an equivalence for their
fields.

### Example

```ts
const eqObjectNumber = createEqObject({ a: eqNumber });
eqObjectNumber({ a: 1 }, { a: 1 }); // true
eqObjectNumber({ a: 1 }, { a: 2 }); // false
```