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Version: 7.3.0

featureReduce

描述​

🌐 Description

减少任何 GeoJSON 对象中的要素，类似于 Array.reduce()。

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

参数​

🌐 Parameters

名称类型描述
geojsonFeatureCollection | Feature | Feature<GeometryCollection>任何 GeoJSON 对象
callbackfeatureReduceCallback一种接受（previousValue, currentFeature, featureIndex）的方法
initialValue?归约器作为回调的第一次调用的第一个参数使用的值。

返回​

🌐 Returns

归约器 归约操作的结果值。

示例​

🌐 Examples

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

turf.featureReduce(
  features,
  function (previousValue, currentFeature, featureIndex) {
    //=previousValue
    //=currentFeature
    //=featureIndex
    return currentFeature;
  },
);

安装​

🌐 Installation

$ npm install @turf/meta

import { featureReduce } from "@turf/meta";
const result = featureReduce(...);
$ npm install @turf/turf

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