Seeded random number generator

README.md

rng

Seeded random number generator.
Down to ~500 bytes when minified.
Down to ~260 bytes when gzipped.

Usage

var rng = require('./rng');
var rand = rng(1337);

rand.int(100);                    // 57
rand.float();                     // 0.48787342294965175
rand.bool();                      // false
rand.range(4, 12);                // 10
rand.pick(['foo', 'bar', 'baz']); // 'baz'

API

rng(seed)

Returns a RNG using the specified seed.

rand.int(max)

Returns an integer within [0, max).

rand.float()

Returns a float within [0.0, 1.0).

rand.bool()

Returns a boolean.

rand.range(min, max)

Returns an integer within [min, max).

rand.pick(source)

Returns an element from the source.

LICENSE

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004
 
 Copyright (C) 2014 Florent Cailhol <https://github.com/ooflorent>
 
 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.
 
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
  0. You just DO WHAT THE FUCK YOU WANT TO.

rng.js

module.exports = function(seed) {
  var random = whrandom(seed);
  var rng = {
    /**
     * Return an integer within [0, max).
     *
     * @param  {int} [max]
     * @return {int}
     * @api public
     */
    int: function(max) {
      return random() * (max || 0xfffffff) | 0;
    },
    /**
     * Return a float within [0.0, 1.0).
     *
     * @return {float}
     * @api public
     */
    float: function() {
      return random();
    },
    /**
     * Return a boolean.
     *
     * @return {Boolean}
     * @api public
     */
    bool: function() {
      return random() > 0.5;
    },
    /**
     * Return an integer within [min, max).
     *
     * @param  {int} min
     * @param  {int} max
     * @return {int}
     * @api public
     */
    range: function(min, max) {
      return rng.int(max - min) + min;
    },
    /**
     * Pick an element from the source.
     * 
     * @param  {mixed[]} source
     * @return {mixed}
     * @api public
     */
    pick: function(source) {
      return source[rng.range(0, source.length)];
    }
  };

  return rng;
};

/**
 * Generate a seeded random number using Python's whrandom implementation.
 * See https://github.com/ianb/whrandom for more information.
 *
 * @param  {int} [seed]
 * @return {Function}
 * @api private
 */
function whrandom(seed) {
  if (!seed) {
    seed = Date.now();
  }

  var x = (seed % 30268) + 1;
  seed = (seed - (seed % 30268)) / 30268;
  var y = (seed % 30306) + 1;
  seed = (seed - (seed % 30306)) / 30306;
  var z = (seed % 30322) + 1;
  seed = (seed - (seed % 30322)) / 30322;

  return function() {
    x = (171 * x) % 30269;
    y = (172 * y) % 30307;
    z = (170 * z) % 30323;
    return (x / 30269.0 + y / 30307.0 + z / 30323.0) % 1.0;
  };
}

Hiiii.....I need help..... I want last three digit number (RNG)...I HAVE PERVIOUS NUMBERS IF ANYONE CAN HELP ME.........PLEASE...... Waiting for the response.......