collectionOf

Enforce expectations about types of FeatureCollection inputs for Turf. Internally this uses geojsonType to judge geometry types.
执行对FeatureCollection类型的期望。在内部，它使用geojsonType来判断几何类型。

> npm install @turf/invariant

参数

参数	类型	描述
featureCollection	FeatureCollection	a FeatureCollection for which features will be judged
type	string	expected GeoJSON type
name	string	name of calling function

示例

var locationA = turf.point([-75.343, 39.984], {name: 'Location A'});
var locationB = turf.point([-75.833, 39.284], {name: 'Location B'});
var locationC = turf.point([-75.534, 39.123], {name: 'Location C'});

var pointCollection = turf.featureCollection([
  locationA,
  locationB,
  locationC
]);

turf.collectionOf(pointCollection, 'Point', 'Location A');