Convert immutable array from string to number

Question

I have a Vanilla JS array, containing numbers as strings.

const stringArray = ['1', '2', '3', '4'];

If I want to convert all the numbers in the array to intger I simply do

const integerArray = stringArray.map(Number);

Now, I have an Immutable JS List

const immutableListStrings = Immutable.List(stringArray);

Using

immutableListStrings.map(Number);

does not convert the strings to integer. Why is that?

I have no knowledge about immutable.js, but in vanilla JS Array.prototype.map does not change the array in place. — Gerardo Furtado
– Gerardo Furtado, Commented Oct 17, 2019 at 8:59
Just like with standard map, Immutable's .map returns a new List (immutable-js.github.io/immutable-js/docs/#/List/map). In fact, the whole point of the library is to create/use immutable data structures so operations usually return a new value. — Felix Kling
– Felix Kling, Commented Oct 17, 2019 at 9:02

kemicofa · Accepted Answer · 2019-10-17 09:01:26Z

2

map in general literally maps through your list values and allows you to transform them before putting them into a new list.

map does not transform your current list.

You simply need to create a new variable (i.e.: immutableNumbers)

const stringArray = ['1', '2', '3', '4'];
const immutableListStrings = Immutable.List(stringArray);
const immutableNumbers = immutableListStrings.map(Number);

console.log(immutableNumbers);

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js"></script>

answered Oct 17, 2019 at 9:01

kemicofa

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