如何填充空数组-无效语法

let arr = [];
for (let i = 0; i < 5; i++) {
  arr.push(i);
}
console.log(arr); // [0, 1, 2, 3, 4]

arr = []
for i in range(5):
  arr.append(i)
print(arr) # [0, 1, 2, 3, 4]

import java.util.ArrayList;
import java.util.List;

List<Integer> arr = new ArrayList<>();
for (int i = 0; i < 5; i++) {
  arr.add(i);
}
System.out.println(arr); // [0, 1, 2, 3, 4]

List<int> arr = new List<int>();
for (int i = 0; i < 5; i++) {
  arr.Add(i);
}
Console.WriteLine(string.Join(", ", arr)); // 0, 1, 2, 3, 4