Adding elements to the List inside setState() method, not saving element Flutter

Question

I'm adding another list items to new List and performing this code inside the setState(). But whenever I call this class in which the new list is initialized, list's previous entry gets disappear.. dont know why this happening. Also im new to flutter. thanks in advance.

List<String> myList = [];

inside build(stateful widget),

onTap: (){
setState((){
myList.add("newstring");
});}

Answer 1

you should copy objects in setState, in your case it should be

onTap: () {
    setState((){
        myList = [...state.myList, "newstring"];
    });
}