createLinearRing and other factory methods returning, running, but returning, undefined

[Nicholas Komsa]

createLinearRing and other factory methods returning undefined?

I am trying to create a polygon, and pass in createLinearRing. The function does array validation and errors on an ill-formed array. However with a good array, it simply returns, undefined. 

I have made use of the jsts.io.GeoJSONReader/Writer to good effect, so that is working. 

I am new to this library, and have tried both the es5 and node versions.