module.exports = join

function join(targets, hint) {
  if(!targets.length) {
    return new Uint8Array(0)
  }

  var len = hint !== undefined ? hint : get_length(targets)
    , out = new Uint8Array(len)
    , cur = targets[0]
    , curlen = cur.length
    , curidx = 0
    , curoff = 0
    , i = 0

  while(i < len) {
    if(curoff === curlen) {
      curoff = 0
      ++curidx
      cur = targets[curidx]
      curlen = cur && cur.length
      continue
    }
    out[i++] = cur[curoff++] 
  }

  return out
}

function get_length(targets) {
  var size = 0
  for(var i = 0, len = targets.length; i < len; ++i) {
    size += targets[i].byteLength
  }
  return size
}