geomReduce

描述

¥Description

Reduce geometry in any GeoJSON object, similar to Array.reduce().

参数

¥Parameters

名称	类型	描述
geojson	FeatureCollection | 特性 | GeometryObject | GeometryCollection | 特性<GeometryCollection>	任意 GeoJSON 对象
callback	geomReduceCallback	a method that takes (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId)
initialValue?	Reducer	Value to use as the first argument to the first call of the callback.

返回

¥Returns

Reducer The value that results from the reduction.

示例

¥Examples

var features = turf.featureCollection([
  turf.point([26, 37], { foo: "bar" }),
  turf.point([36, 53], { hello: "world" }),
]);

turf.geomReduce(
  features,
  function (
    previousValue,
    currentGeometry,
    featureIndex,
    featureProperties,
    featureBBox,
    featureId,
  ) {
    //=previousValue
    //=currentGeometry
    //=featureIndex
    //=featureProperties
    //=featureBBox
    //=featureId
    return currentGeometry;
  },
);

安装

¥Installation

$ npm install @turf/meta

import { geomReduce } from "@turf/meta";
const result = geomReduce(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.geomReduce(...);