How, using ImmutableJS, do I produce a new map by mapping over the key/value pairs of an input map? In Scala, I would do something like this: scala> Map(1->2, 3->4).toSeq.map{case (k, v)...

I am currently working on React JS and React Native frameworks. On the half way road I came across Immutability or the Immutable-JS library, when I was reading about Facebook's Flux and Redux imple...

I am looking to store a list of unique string (hence Set) and wanted to retrieve the value based on the index. I used get(index) But it turned out it returns undefined. So it seems I did not unders...

I've got a prop on a ReactJS Component that's either null or an Immutable Map. At the bottom of my widget if I write: MyComponent.propTypes = { myMap: React.PropTypes.instanceOf(Immutable.Map) ...

I have a react-redux application written in typescript with immutable package. There I have a data, which comes from api and in store I pack it to Map. In all application they are used as a Map. I...

I want to be able to look at my immutable objects for debugging. I find it very difficult to look through an object by clicking on entries and such. Ideally what I would like is the opposite of the...

I am missing a option how to get the index number inside the map function using List from Immutable.js: var list2 = list1.map(mapper => { a: mapper.a, b: mapper.index??? }).toList(); Document...

I am currently following this tutorial. I've hit a bit of a snag involving mapStateToProps in the following code: import React from 'react'; import Voting from './voting'; import {connect} from 'r...

I'm working on a Vue.js application where I have to deal with deeply nested data structures (trees and forests). After reading about using simple data structures, pure functions and reducing (non-...

I am new to immutable.js. Is there any difference between map from immutable.js and map from ES6? If there is no difference, why do we need to use immutable.js? immutable.js const { Map } = requi...

I am using immutable-js and react-immutable-proptypes in React. // CommentBox.jsx getInitialState() { return { comments: Immutable.List.of( {author: 'Pete Hunt', text: 'Hey there!'}, {author: ...

I have worked on a couple of projects using React.js. Some of them have used Flux, some Redux and some were just plain React apps utilizing Context. I really like the way how Redux is using funct...

How is possible to change 3/4 elements? Expected output is [1,2,4,3,5] let list = [1,2,3,4,5]; const removeElement = list.indexOf(3); // remove number 3 list.slice(0, removeElement).concat(list.sl...

As the title states, I want to get the index of a particular item. Is there a way to do this? const key = 1 const map = new Immutable.OrderedMap([5, 'a'], [3, 'b'], [1, 'c']) So, in this case, t...

Is there a way to diff objects in Immutable? Example: let a = Immutable.fromJS({ a: 10 }); let b = Immutable.fromJS({ b: 10 }); let d = Immutable.diff(a, b); // { a: 10 } console.log(d.toJS())...

I want to retrieve keys() from the following Immutable Map: var map = Immutable.fromJS({"firstKey": null, "secondKey": null }); console.log(JSON.stringify(map.keys())); I would expect the output...

Question Is there something wrong with my benchmark? How can Immutable.js find() be 8 times slower than array.find()? Ok, not entirely fair, since I'm using Immutable.Map inside of the Immutable...

Here is what official docs said updateIn(keyPath: Array<any>, updater: (value: any) => any): List<T> updateIn(keyPath: Array<any>, notSetValue: any, updater: (value: any) =&gt...

I've got an immutable map of maps. let mapOfMaps = Immutable.fromJS({ 'abc': { id: 1 type: 'request' }, 'def': { id: 2 type: 'response' }, 'ghi': { type: cancel' }, 'jkl': { type: 'ed...

It seems like when using redux with react, immutable.js has become almost a industry standard. My question is, aren't we making changes to our redux states immutably when we are using the spread op...

So, I have List a: let a = Immutable.List([1]) and List b: let b = Immutable.List([2, 3]) I want to get List union === List([1, 2, 3]) from them. I try to merge them fist: let union = a.me...

I would like Sanctuary to provide Fantasy Land -compatible Map and Set types with value-based equality semantics. Ideally these values would be immutable, though this is not critical since Sanctuar...

I have angular2 app and i'm using immutable.js. When i use user Map function from immutable typescript compiler gets stuck. When i don't import the typing from immutable.js it works fine but i get ...

I have a immutable list object, within a Map object, as follows: let initialState = Immutable.fromJS({}); state = initialState; state = state.set("myList", Immutable.List()); How do I append a v...

In my application I use D3.js for some visualizations. Now D3 works with mutable native JavaScript data structures. So some data marshalling would be necessary for this to work with Immutable.js...