@enonic/js-utils/value/isGeoPointArray.ts

Enonic XP JavaScript Utils

import type {GeoPointArray} from '../types/index.d';

import {isNumber} from './isNumber';


export function isGeoPointArray(v :GeoPointArray | unknown) :v is GeoPointArray {
	if (
		!Array.isArray(v)
		|| v.length !== 2 // Even if the two first items are valid, if there are more items, it's not a GeoPointArray
	) { return false; }

	// tslib is required (transpile time) to support Array deconstruction.
	// Even though it's easy to avoid using Array deconstruction,
	//  since tslib is already used for export {} from,
	//   it's kept as a development dependency.
	const [lat, lon] :number[] = v;

	if (!isNumber(lat) && !isNumber(lon)) { return false; }

	if ((lat as number) < -90 || (lat as number) > 90) { return false; }

	if ((lon as number) < -180 || (lon as number) > 180) { return false; }

	return true;
}