Mastering Immutable.js

Wrapping behavior maps in functions

Calling get() directly on a map in order to run the appropriate behaviors is unlikely. Instead, you can wrap the Map declaration and the get() function together into a function. Then you can call the function with the key that determines which behavior will run, as shown here:

const myBehavior = action => Map.of(  'first', () => console.log('first'),  'second', () => console.log('second'),  'third', () => console.log('third')).get(action)();

Now you can pass an action to myBehavior(), and the corresponding path is followed through the map:

myBehavior('first');// -> firstmyBehavior('second');// -> second

By calling myBehavior(), you're also calling the corresponding function from the map that's looked up by ...