深入理解JS实现快速排序和去重

quickSort = function(arr){
if(arr.length < ){
return arr;
}
var tmp = arr.splice(Math.floor(arr.length/), )[],
arrLeft = [],
arrRight = [];
for(var i = ; i < arr.length; i++){
if(arr[i] >= tmp){
arrRight.push(arr[i]);
}else{
arrLeft.push(arr[i]);
}
}
return arguments.callee(arrLeft).concat(tmp,arguments.callee(arrRight));
}

var unique = function(arr){
var newArr = [];
while(arr.length){
var value = arr.shift();
for(var i = , len = arr.length; i<len; i++){
if(value == arr[i]){
break;
}
}
if(i == len){
newArr.push(value);
}
}
return newArr;
}

var unique = function(arr){
var arr = [];
var obj = {};
for(var i = , len = a.length; i < len; i++){
if(!obj[a[i]]){
obj[a[i]] = ;
arr.push(a[i]);
}
}
console.log(obj)
return arr;
};

var unique = function(arr){
var newArr = [];
for(var i = , len = arr.length; i <len; i++){
if(arr[i] !== arr[i+]){
newArr.push(arr[i]);
}
if(i == len){
newArr.push(arr[i]);
}
}
return newArr;
}