Mastering Immutable.js

Merging lists of maps

Let's see what happens when we merge lists of maps:

const myList1 = List.of(  Map.of('one', 1, 'two', 2),  Map.of('three', 3, 'four', 4));const myList2 = List.of(  Map.of('one', 11, 'two', 22, 'three', 3),  Map.of('four', 44, 'five', 5, 'size', 6));const myMergedList = myList1.merge(myList2);console.log('myList1', myList1.toJS());// -> myList1 [ { one: 1, two: 2 }, { three: 3, four: 4 } ]console.log('myList2', myList2.toJS());// -> myList2 [ { one: 11, two: 22, three: 3 },// ->           { four: 44, five: 5, size: 6 } ]console.log('myMergedList', myMergedList.toJS());// -> myMergedList [ { one: 11, two: 22, three: 3 },// ->                { four: 44, five: 5, size: 6 } ]

The values from myList2 override the values at the corresponding indexes in ...