Advance

This example demonstrates the Advance() method, which skips ahead N steps in the random sequence. It’s equivalent to calling NextInt() N times, but much more efficient for large N.

Expected Output

Result after <iterations> iterations: <result_value>

The <result_value> is the random number at position <iterations> in the sequence. The example validates that manual iteration and advance() produce identical results.

Source Codes

Go

package main

import (
  "fmt"

  "github.com/pseudata/pseudata"
)

func main() {
  gen1 := pseudata.NewGenerator(42, 0)
  gen2 := pseudata.NewGenerator(42, 0)

  gen1.Advance(10_000_000)

  for range 10_000_000 {
    gen2.NextInt()
  }

  result1 := gen1.NextInt()
  result2 := gen2.NextInt()

  if result1 != result2 {
    panic(fmt.Sprintf("Results don't match! Advance=%d, Loop=%d", result1, result2))
  }

  println(result1)
}

Java

import dev.pseudata.Generator;

public class Main {
  public static void main(String[] args) {

    var gen1 = new Generator(42, 0);
    var gen2 = new Generator(42, 0);

    gen1.advance(10_000_000);

    for (int i = 0; i < 10_000_000; i++) {
      gen2.nextInt();
    }

    var result1 = gen1.nextInt();
    var result2 = gen2.nextInt();

    if (result1 != result2) {
      throw new RuntimeException(
          String.format("Results don't match! Advance=%d, Loop=%d", result1, result2));
    }

    System.out.println((long) result1 & 0xFFFFFFFFL);
  }
}

Python

from pseudata import Generator

gen1 = Generator(42, 0)
gen2 = Generator(42, 0)

gen1.advance(10_000_000)

for _ in range(10_000_000):
    gen2.next_int()

result1 = gen1.next_int()
result2 = gen2.next_int()

if result1 != result2:
    raise Exception(f"Results don't match! Advance={result1}, Loop={result2}")

print(result1)

TypeScript

import { Generator } from "@pseudata/core";

const gen1 = new Generator(42, 0);
const gen2 = new Generator(42, 0);

gen1.advance(10_000_000);

for (let i = 0; i < 10_000_000; i++) {
  gen2.nextInt();
}

const result1 = gen1.nextInt();
const result2 = gen2.nextInt();

if (result1 !== result2) {
  throw new Error(`Results don't match! Advance=${result1}, Loop=${result2}`);
}

console.log(result1);