how to merge nested maps in immutable.js

Question

import {Map} from 'immutable'

let map1 = Map({a:1,b:{c:2,d:3,e:1});
let map2 = Map({c:100,d:400});

how do I get Map {a:1,b:{c:100,d:400,e:1}} by merging map1 and map2?

Matt Watson · Accepted Answer · 2017-07-20 16:39:00Z

2

You can use immutable.js built in mergeIn function. You will have to tweak map1 slightly so that the nested Map is also an instance of Map

The following code does the job:

let map1 = Map({ a: 1, b: Map({ c: 2, d: 3, e: 1 })})
let map2 = Map({ c: 100, d: 400 })
let map3 = map1.mergeIn(['b'], map2)

answered Jul 20, 2017 at 16:39

Matt Watson

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