d3-scale 3.0.0

on Node.js NPM

• Accept iterables wherever appropriate. #163
• Adopt ES Map; drop d3-collection dependency. #165

Note: this release adopts ES2015 language features such as for-of and drops support for older browsers, including IE. If you need to support pre-ES2015 environments, you should stick with d3-scale 2.x or use a transpiler.