text: var rng = require('./lib/rng');
  var bytesToUuid = require('./lib/bytesToUuid');
  
  function v4(options, buf, offset) {
    var i = buf && offset || 0;
  
    if (typeof(options) == 'string') {
      buf = options === 'binary' ? new Array(16) : null;
      options = null;
    }
    options = options || {};
  
    var rnds = options.random || (options.rng || rng)();
  
    // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
    rnds[6] = (rnds[6] & 0x0f) | 0x40;
    rnds[8] = (rnds[8] & 0x3f) | 0x80;
  
    // Copy bytes to buffer, if provided
    if (buf) {
      for (var ii = 0; ii < 16; ++ii) {
        buf[i + ii] = rnds[ii];
      }
    }
  
    return buf || bytesToUuid(rnds);
  }
  
  module.exports = v4;
  