CODEWITHSUNDEEP
javascriptimmutable.js
darKnight
darKnight

Reputation: 6481

Iterating over Immutable JS Map

Consider this code:

const map1 = Immutable.Map({a:1, b:2, c:3});

const myMap = map1.map((elem, index) => {
    return "Hello " + elem;
})

console.log(myMap.toJS());
// prnts {a: "Hello 1", b: "Hello 2", c: "Hello 3"}

I want the output as ['Hello1', 'Hello2, 'Hello3'], but map is giving me an object with the keys also. Why am I not getting an array as output like a normal JavaScript map works? And what is the best way to achieve the desired result? (I can use forEach instead of map, and push the result of each iteration in an array, but I am looking for a better method).

Upvotes: 2

Views: 1161

Answers (3)

jamesjaya
jamesjaya

Reputation: 665

Just providing a different flavor using reduce

const map1 = Immutable.Map({a:1, b:2, c:3});

const myMap = map1.reduce((accumulator, value) => {
    accumulator.push("Hello" + value);
    return accumulator;
}, [])

console.log(myMap);
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.js"></script>

Upvotes: 0

AurA
AurA

Reputation: 12373

You can get the array by simply using myMap.keys 

Array.from(myMap.keys());

Runnable code snippet for the same is as under:

const map1 = Immutable.Map({a:1, b:2, c:3});

const myMap = map1.map((elem, index) => {
    return "Hello " + elem;
})

console.log(Array.from(myMap.keys()));

Upvotes: 0

Grzesiek Danowski
Grzesiek Danowski

Reputation: 467

Use toArray() instead toJS():

const map1 = Immutable.Map({a:1, b:2, c:3});

const myMap = map1.map((elem, index) => {
    return "Hello " + elem;
})

console.log(myMap.toArray());
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.js"></script>

Upvotes: 1

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