flattenReduce

Description

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

Parameters

Name	Type	Description
geojson	FeatureCollection | Feature | GeometryObject | GeometryCollection | Feature<GeometryCollection>	any GeoJSON object
callback	flattenReduceCallback	a method that takes (previousValue, currentFeature, featureIndex, multiFeatureIndex)
initialValue?	Reducer	Value to use as the first argument to the first call of the callback.

Returns

Reducer The value that results from the reduction.

Examples

var features = turf.featureCollection([
  turf.point([26, 37], { foo: "bar" }),
  turf.multiPoint(
    [
      [40, 30],
      [36, 53],
    ],
    { hello: "world" },
  ),
]);

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

Installation

$ npm install @turf/meta

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

$ npm install @turf/turf

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