Here vs. ArcGIS API for JavaScript
Take a look at this side-by-side comparison of Here and ArcGIS API for JavaScript.
At a Glance
Here
About Here
HERE is a PaaS for creating custom maps, visualize location datasets, gather insights and buy and sell location assets.
ArcGIS API for JavaScript
About ArcGIS API for JavaScript
ArcGIS API for JavaScript is a tool used to embed maps and tasks in web applications.