Mastering Immutable.js

Producing minimums and maximums

An example of where mapping and filtering collections would be insufficient is finding minimum and maximum values. Let's implement some reducers to find these values in a collection:

const myList = List.of(  Map.of('red', 3, 'black', 4),  Map.of('red', 6, 'black', 8),  Map.of('red', 9, 'black', 12));const minRedReduce = myList.reduce(  (result, v) => v.get('red') < result ?    v.get('red') :    result,  myList.first().get('red'));const maxRedReduce = myList.reduce(  (result, v) => v.get('red') > result ?    v.get('red') :    result,  myList.first().get('red'));console.log('minRedReduce', minRedReduce);// -> minRedReduce 3console.log('maxRedReduce', maxRedReduce);// -> maxRedReduce 9

The result argument that's passed to the iteratee ...