// String functions
print("=== String Functions ===")
print("upper:", upper("hello"))
print("lower:", lower("WORLD"))
print("substr:", substr("hello world", 0, 5))
print("trim:", trim("  spaced  "))
parts = split("a,b,c", ",")
print("split:", parts[0], parts[1], parts[2])
print("join:", join(["one", "two", "three"], "-"))

// Type conversion
print("\n=== Type Conversion ===")
print("tostring:", tostring(42))
print("tonumber:", tonumber("3.14"))
print("tobool:", tobool(1), tobool(0), tobool("text"), tobool(""))

// Math functions
print("\n=== Math Functions ===")
print("floor:", floor(3.7))
print("ceil:", ceil(3.2))
print("round:", round(3.5))
print("abs:", abs(-42))
print("min:", min(5, 2, 8, 1))
print("max:", max(5, 2, 8, 1))
print("sqrt:", sqrt(16))
print("pow:", pow(2, 3))
print("clamp:", clamp(15, 10, 20), clamp(5, 10, 20), clamp(25, 10, 20))

// Array/Object functions
print("\n=== Array/Object Functions ===")
obj = {name = "Alice", age = 30, city = "NYC"}
print("keys:", keys(obj))
print("values:", values(obj))

arr = [3, 1, 4, 1, 5, 9]
sorted = sort(arr)
print("sort:", sorted)

// Utility functions
print("\n=== Utility Functions ===")
nums = range(1, 5)
print("range:", nums[0], nums[1], nums[2], nums[3], nums[4])

range_step = range(10, 1, -2)
print("range with step:", range_step)

// Range edge cases
single = range(5, 5)
print("single element range:", single)

// Test exit would stop here
// exit("Done!")