# core/predicates/schema.predicate.ts

> 5 lines of code and 2 definitions.

Tree: GovLab Patterns
Language: typescript
Layer: infrastructure
Canonical: https://banes-lab.com/anatomy/patterns#file-patterns-core-predicates-schema-predicate-ts
Source text: https://banes-lab.com/source/patterns/core/predicates/schema.predicate.ts.txt

Listed in [core/predicates](https://banes-lab.com/api/source/patterns/core/predicates.md), after [core/predicates/representation.predicate.ts](https://banes-lab.com/source/patterns/core/predicates/representation.predicate.ts.md).

## Definitions

- `isCoordinatePair` (lexical_declaration, line 5, exported)
- `COORDINATE_PAIR` (lexical_declaration, line 3)

## Contained in

- [core/predicates](https://banes-lab.com/anatomy/patterns/folder-patterns-core-predicates.md)

## Used by

- [core/resolvers/representation.resolver.ts](https://banes-lab.com/source/patterns/core/resolvers/representation.resolver.ts.md)

## Linked from

- [core/resolvers](https://banes-lab.com/anatomy/patterns/folder-patterns-core-resolvers.md)

## Source

```typescript
import type { FieldSchema } from "#types/schema.types";

const COORDINATE_PAIR = 2;

export const isCoordinatePair = function isCoordinatePair(field: FieldSchema): boolean {
    return field.kind === "list" && field.elementNumeric && field.fixedLength === COORDINATE_PAIR;
};
```