How to loop through immutable and push it to array Javascript

Question

I have my form field values in an immutable object.
I use getIn immutable function to access it.

For example, if I have to access field, i use const users = formFields.getIn(['0', value]).
Now, i have a variable

users = 4`

This means, there will be 4 fields in immutable from which i need to pick up the users age.

e.g.

1st user age will be stored in formFields.getIn(['1', value])
2nd user age will be stored in formFields.getIn(['2', value])
and so on

How do i loop through the user age list based on the users variable?
I tried something like this:

const userAgeList = [];
if (users >0) {
  userAgeList.push(formFields.getIn([[i], value]));
}

With above code formFields.getIn([[i], value]), i get undefined because the value is not actually on this. its on formFields.getIn(['i', value]).

How do i pass the loop variable i as a string so i can get the field values?

[i] this makes an array with one value, the value of i. Is this what you're expecting? — evolutionxbox
– evolutionxbox, Commented Oct 20, 2020 at 11:58
@evolutionxbox- if i just use i, it will be number. i want to use 'i' — Antanio D
– Antanio D, Commented Oct 20, 2020 at 12:00
@ashwinprabhu, Did you tried like, formFields.getIn([`${i}`, value]) ?? — Maniraj Murugan
– Maniraj Murugan, Commented Oct 20, 2020 at 12:00

Giulio Caccin · Accepted Answer · 2020-10-30 10:23:56Z

2

If what you have is a List containing Map objects, you can use a map to loop all the values:

const userAgeList = formFields
  .map(field -> field.get('value'))
  .toArray()

This will give you an array of the values you need.
If you want to take only at a specific i, convert it to a number and then you can combine skip and take in this fashion:

const userAgeList = formFields
  .skip(i)
  .take(1)
  .map(field -> field.get('value'))
  .toArray()

This will return you a one element array at the i position.

edited Oct 30, 2020 at 10:23

answered Oct 30, 2020 at 10:10

Giulio Caccin

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