function range(start, end){
  return Array(end - start + 1).join(' ').split(' ').map(function(s,i){ return i + start });
}


// numbers and strings, O(n)
function primitiveUnique(arr){
  return Object.keys(arr.reduce(function(r, s){
    return r[s] = 1, r;
  }, {}));
}

// all value types
function unique(arr){
  return arr.filter(function(s, i, a){
    return i === a.lastIndexOf(s);
  });
}

function isType(compare){
  if (typeof compare === 'string' && /^\w+$/.test(compare)) {
    compare = '[object ' + compare + ']';
  } else {
    compare = Object.prototype.toString.call(compare);
  }
  return isType[compare] || (isType[compare] = function(o){
    return Object.prototype.toString.call(o) === compare;
  });
}

var isArray = isType([]); // same as isType('Array')
var isArguments = isType('Arguments');

var callbind = Function.prototype.call.bind.bind(Function.prototype.call);
var applybind = Function.prototype.call.bind.bind(Function.prototype.apply);
var slice = callbind(Array.prototype.slice);
var pushall = applybind(Array.prototype.apply);
var toClass = callbind(Object.prototype.toString);

function someFn(){ var args = slice(arguments) }

var arr = [];
function anotherFn(){ pushall(arr, arguments) }