using System;
using System.Collections.Generic;
using System.Text.Json;
//the length of the array type does not change
//it is recommended to use a class List
var primeNumbers = new List<int> {2, 5, 7};
primeNumbers.Add(11);
//primeNumbers is {2, 5, 7, 11}
ShowList(primeNumbers);
primeNumbers.Insert(1, 3);
//primeNumbers is {2, 3, 5, 7, 11}
ShowList(primeNumbers);
primeNumbers.RemoveAt(2);
//primeNumbers is {2, 3, 7, 11}
ShowList(primeNumbers);
primeNumbers.AddRange(new[] {13, 17});
//primeNumbers is {2, 3, 7, 11, 13, 17}
ShowList(primeNumbers);
primeNumbers.RemoveRange(0, 2);
primeNumbers.InsertRange(0, new[] {2, 3, 5});
//primeNumbers is {2, 3, 5, 7, 11, 13, 17}
ShowList(primeNumbers);
primeNumbers.Clear();
//primeNumbers is {}
ShowList(primeNumbers);
void ShowList(List<int> list) {
Console.WriteLine(JsonSerializer.Serialize(list));
}