print("=== Arrays Demo ===");
print("");

print("--- Array Literals ---");
empty = {};
print("Empty array length:", len(empty));

numbers = {1, 2, 3, 4, 5};
print("Numbers:", numbers[0], numbers[1], numbers[2], numbers[3], numbers[4]);
print("Length:", len(numbers));

mixed = {42, "hello", 3.14, null};
print("Mixed array:");
print("  int:", mixed[0]);
print("  str:", mixed[1]);
print("  float:", mixed[2]);
print("  null:", mixed[3]);

print("");
print("--- Array Indexing ---");
fruits = {"apple", "banana", "cherry", "date"};
print("First element:", fruits[0]);
print("Last element:", fruits[3]);

print("");
print("--- Array Modification ---");
arr = {10, 20, 30};
print("Before:", arr[0], arr[1], arr[2]);
arr[1] = 25;
print("After arr[1] = 25:", arr[0], arr[1], arr[2]);

print("");
print("--- Array Methods ---");
stack = {};
stack.push(1);
stack.push(2);
stack.push(3);
print("Stack length:", len(stack));

popped = stack.pop();
print("Popped:", popped);
print("After pop length:", len(stack));

print("");
print("--- Array Join ---");
words = {"Hello", "World"};
sentence = words.join(" ");
print("Joined with space:", sentence);

nums = {1, 2, 3};
csv = nums.join(",");
print("Joined with comma:", csv);

print("");
print("--- Array indexOf ---");
items = {"apple", "banana", "cherry"};
idx = items.indexOf("banana");
print("Index of 'banana':", idx);

idx = items.indexOf("grape");
print("Index of 'grape' (not found):", idx);

print("");
print("--- Array Slice ---");
source = {0, 1, 2, 3, 4, 5};
sliced = source.slice(2, 4);
print("slice(2, 4):", sliced[0], sliced[1]);

print("");
print("--- Iterating Arrays ---");
colors = {"red", "green", "blue"};
print("Colors:");
for (i = 0; i < len(colors); i++) {
    print("  ", colors[i]);
}

print("");
print("--- Building Arrays ---");
squares = {};
for (i = 1; i <= 5; i++) {
    squares.push(i * i);
}
print("Squares of 1-5:");
for (i = 0; i < len(squares); i++) {
    print("  ", squares[i]);
}

print("");
print("--- Nested Arrays ---");
matrix = {
    {1, 2, 3},
    {4, 5, 6},
    {7, 8, 9}
};
print("3x3 Matrix:");
for (row = 0; row < len(matrix); row++) {
    print("  ", matrix[row][0], matrix[row][1], matrix[row][2]);
}

print("");
print("All array tests completed");