Question

Iterate over 2-vertex line segment in any GeoJSON object, similar to Array.forEach() (Multi)Point geometries do not contain segments therefore they are ignored during this operation.
遍历任何GeoJSON对象中的2-vertex线段，类似于Array.forEach() (Multi)Point几何图形不包含线段，因此在此操作期间将忽略它们。

> npm install @turf/meta

参数

参数	类型	描述
geojson	(FeatureCollection|Feature|Geometry)	any GeoJSON
callback	Function	回调函数 (currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex)

返回

undefined - undefined

示例

// 注意：polygon首尾坐标要一致
var polygon = turf.polygon([[[-50, 5], [-40, -10], [-50, -10], [-40, 5], [-50, 5]]]);

// Iterate over GeoJSON by 2-vertex segments
turf.segmentEach(polygon, function (currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex) {
  //=currentSegment
  //=featureIndex
  //=multiFeatureIndex
  //=geometryIndex
  //=segmentIndex
});

// Calculate the total number of segments
var total = 0;
turf.segmentEach(polygon, function () {
    total++;
});