Now we know how to create an Immutable Map, we’ll take a look at how we can get data from it, and how to add and delete items from it, all without mutating it. Note that the usual caveat applies: Immutable does not change a Map with any operation, so whenever you see phrases such as ‘delete an item from a Map’, the mutation occurs in a copy of the Map being operated on, which is returned from the
![Immutable.js: Get, Set, Update and Delete Data from Maps](https://cdn-ak-scissors.b.st-hatena.com/image/square/e83347174f773af1c8da1cd2a4dd65f001164bb4/height=288;version=1;width=512/http%3A%2F%2Funtangled.io%2Fwp-content%2Fuploads%2F2014%2F11%2F10143283926_94c4489682_o-680x453.jpg)