add pointArray function

README.md

@@ -156,6 +156,19 @@ util.geo.multi({
 })
 ```
 
+#### util.geo.pointArray({ longitude, latitude, elevation })
+
+Never worry about getting the order of parameters in a GeoJSON point array wrong again. Returns a properly formed GeoJSON array for use in a point.
+
+Returns null if either longitude or latitude is missing. If elevation is null, it is simply ignored.
+
+```js
+{
+  type: 'Point',
+  coordinates: util.geo.pointArray({ longitude: -112.052790, latitude: 33.505195, elevation: null })
+}
+```
+
 #### util.geo.simplify(value)
 
 Simplifies any given GeoJSON geometry to the precision of a meter. Values that do not need simplification will be returned with no modifications.

src/util/geo/pointArray.js

@@ -0,0 +1,6 @@
+import _ from 'lodash'
+
+export default ({ longitude, latitude, elevation }) => {
+  if (!longitude || !latitude) return null
+  return _.compact([ longitude, latitude, elevation ])
+}

test/geo/pointArray.js

@@ -0,0 +1,22 @@
+/*eslint no-console: 0*/
+import should from 'should'
+import _ from 'lodash'
+import createUtil from '../../src/util'
+
+const util = createUtil()
+
+describe('geo#pointArray', () => {
+  it('should exist', async () => {
+    should.exist(util.geo.pointArray)
+    should.equal(typeof util.geo.pointArray, 'function')
+  })
+  it('should return valid point array for coords', async () => {
+    _.isEqual(util.geo.pointArray({ longitude: -118.250587, latitude: 34.031179, elevation: 1024 }), [ -118.250587 , 34.031179 , 1024 ]).should.be.true()
+
+    _.isEqual(util.geo.pointArray({ longitude: -118.250587, latitude: 34.031179 }), [ -118.250587 , 34.031179 ]).should.be.true()
+  })
+  it('should return null when either latitude or longitude is left out', async () => {
+    should(util.geo.pointArray({ longitude: -118.250587, latitude: null })).be.null()
+    should(util.geo.pointArray({ longitude: null, latitude: 34.031179 })).be.null()
+  })
+})