Append value to List

Question

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 value to "myList", thereby updating state?

Answer 1

You can use update() method.

const initialState = Immutable.fromJS({});
const state = initialState.set('myList', Immutable.List()); 

const updatedState = state.update('myList', myList => myList.push('some value'));

Answer 2

emails = List(new Array<string>());
defaultValues = ['gold@gmail.com', 'saphire@gmail.com'];
this.emails = this.emails.push(...this.defaultValues);

This is for typescript .