将值附加到List

Question

我在Map对象中有一个不可变的列表对象，如下所示：

let initialState = Immutable.fromJS({});
state = initialState;
state = state.set("myList", Immutable.List());

如何将值附加到＆＃34; myList＆＃34;，从而更新state？

Answer 1

您可以使用update()方法。

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);

这是打字稿。