The std/random module provides a fast xorshift64 pseudo-random number generator, and std/uuid generates RFC 4122 version 4 UUIDs. Both are commonly needed utilities for testing, simulations, and distributed-system identifiers.
// Números aleatorios y UUID v4 import "std/random" import "std/uuid" // bool -> texto: int_to_string() espera un int y un bool no se convierte solo, // así que la conversión se escribe explícita. fn si_no(b: bool) -> String { if b { return "si" } return "no" } fn main() -> int { // Generar 3 números aleatorios entre 1 y 100 print("Numeros aleatorios (1-100):") let r1: int = random_range(1, 100) let r2: int = random_range(1, 100) let r3: int = random_range(1, 100) print(" " + int_to_string(r1)) print(" " + int_to_string(r2)) print(" " + int_to_string(r3)) // random_bool let b: bool = random_bool() print("random_bool: " + si_no(b)) // random_float en [0.0, 1.0) let f: float = random_float() print("random_float: (generado)") // Generar un UUID v4 let id: String = uuid_v4() print("uuid_v4: " + id) print("longitud uuid: " + int_to_string(id.length())) // Validar que el UUID es valido let valido: bool = uuid_is_valid(id) print("uuid valido: " + si_no(valido)) // Generar otro UUID — debe ser diferente let id2: String = uuid_v4() print("segundo uuid: " + id2) print("son distintos: " + si_no(id != id2)) return 0 }
Numeros aleatorios (1-100): 9 5 35 random_bool: si random_float: (generado) uuid_v4: 3d0702c0-6c28-4ecf-b36c-0281c464bea4 longitud uuid: 36 uuid valido: si segundo uuid: 6b14c32d-27b3-4c1a-83e8-d6a093a5f501 son distintos: si
How it works
random_range(lo, hi) returns a uniformly distributed integer in the inclusive range [lo, hi]. random_bool() returns either true or false with equal probability, and random_float() returns a float in [0.0, 1.0). All three are backed by the xorshift64 generator seeded from the system clock at program start.
uuid_v4() generates a 36-character string in the canonical UUID format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The 4 in the third group encodes the version, and the high bits of the fourth group encode the variant. Every call produces a new random UUID; the probability of two UUIDs colliding is astronomically small.
uuid_is_valid(s) validates that a string conforms to the UUID format — useful for sanitizing user input or configuration values before treating them as identifiers. The final assertion confirms that two separately generated UUIDs are always distinct.