Mapping and Reducing

In this chapter, we'll look at mapping and reducing with Immutable.js collections. These are fundamental operations in any Immutable.js application. In particular, you'll learn how to do the following:

• Perform basic mapping operations to produce simple values
• Use complex mapping techniques that add new keys to maps and remove unwanted keys
• Reduce collections to simpler values when basic filtering isn't enough
• Lazily filter and map collections for the ultimate lazy pattern