Parsing data using the fromJS() function

Immutable.js has one more tool for creating immutable data in addition to everything we've looked at so far in this chapter. The fromJS() function is similar to a JSON parser, because it parses the same types of JavaScript objects that you'll see when you parse JSON strings: objects and arrays.

Parsing JavaScript arrays

You can parse a regular JavaScript array, resulting in a list, as shown here:

import { fromJS } from 'immutable';
const myList = fromJS([1, 2, 3]);
console.log('myList', myList.get(0));
// -> myList 1

This is just like passing the array to the List constructor.

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