如何获得数组而不是元素的索引号？

var arr = [1, 2, 3, 4, 5];
// 遍历数组
for (var i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}
// 数组切片
console.log(arr.slice(0, arr.length));
// 数组转换
console.log(arr.join(', '));

arr = [1, 2, 3, 4, 5]
# 遍历数组
for elem in arr:
    print(elem)
# 数组切片
print(arr[:])
# 数组转换
print(', '.join(map(str, arr)))

int[] arr = {1, 2, 3, 4, 5};
// 遍历数组
for (int i = 0; i < arr.length; i++) {
    System.out.println(arr[i]);
}
// 数组切片
System.out.println(Arrays.toString(arr));
// 数组转换
String arrString = Arrays.stream(arr).mapToObj(String::valueOf).collect(Collectors.joining(", "));
System.out.println(arrString);