Mastering Immutable.js

Merging maps with complex keys

Maps can have more complex values as keys, which means that you could have a trickier situation to deal with when there are merge conflicts. Let's reuse our previous example and change the keys into something more involved:

const myMap1 = Map.of(  Map.of('name', 'one'), 1,  Map.of('name', 'two'), 2,  Map.of('name', 'three'), 3);const myMap2 = Map.of(  Map.of('name', 'two'), 22,  Map.of('name', 'three'), 33,  Map.of('name', 'four'), 4);const myMergedMap = myMap1.merge(myMap2);const myMergedWith = myMap1.mergeWith(  v => v,  myMap2);console.log('myMap1', myMap1.toJS());// -> myMap1 { 'Map { "name": "one" }': 1,// ->          'Map { "name": "two" }': 2,// ->          'Map { "name": "three" }': 3 }console.log('myMap2', myMap2.toJS());// ...