JS Array and string to repeat several methods

JS Array to repeat the first of several methods: is also the most stupid bar.

Array.prototype.unique1 = function () {
var r = new Array ();
Label:for (var i = 0, n = this.length; i < n; i++) {
for (var x = 0, y = r.length; x < y; + +) {
if (r[x] = = This[i]) {
Continue label;
}
}
R[r.length] = this[i];
}
return R;
}
The second kind: This is the same as the heavenly book.

Array.prototype.unique2 = function () {
Return This.sort (). Join (",,"). Replace (/(, |^) ([^,]+) (,, \2) + (, |$)/g, "$1$2$4"). Replace (/,,+/g, ","). Replace (/,$/, "" ). Split (",");
}
The third type: Using the object's "hasOwnProperty" method

Array.prototype.unique3 = function () {
var temp = {}, len = This.length;
for (var i=0; i < Len; i++) {
var tmp = this[i];
if (!temp.hasownproperty (TMP)) {
Temp[this[i]] = "My God";
}
}

len = 0;
var temparr=[];
for (var i in temp) {
temparr[len++] = i;
}
return Temparr;
}
The fourth kind: first sorts, the preceding paragraph than latter. This method is quite simple, but also practical

Array.prototype.unique4 = function () {
var temp = new Array ();
This.sort ();
for (i = 0; i < this.length; i++) {
if (this[i] = = This[i+1]) {
Continue
}
Temp[temp.length]=this[i];
}
return temp;

}


The following is often used before, the efficiency is also very good. Feel a little bit like a hash table.

Array.prototype.unique5 = function () {
var res = [], hash = {};
For (var i=0, Elem; (Elem = This[i])! = NULL; i++) {
if (!hash[elem])
{
Res.push (Elem);
Hash[elem] = true;
}
}
return res;
You can also have a simpler and clearer notation:/* Apply a set of ideas, order not repeat */
function RemoveDuplicates (arr) {

var temp = {}, r = [];

for (var i in arr)

Temp[arr[i]] = true;

For (var k in temp)

R.push (k);

return R;

} looks pretty easy. After you have verified it, the code is as follows:

1 functionRemoveDuplicates (arr) {2 3     vartemp = {}, R = [];4 5      for(varIincharr)6 7Temp[arr[i]] =true;8 9      for(varKinchtemp)Ten  One R.push (k); A  -     returnR; -  the } -  - //usage -  + varFruits = [' apple ', ' orange ', ' peach ', ' apple ', ' strawberry ', ' orange ', ' strawberry ', ' orange ']; -  + varUniquefruits =removeduplicates (fruits); Aalert (uniquefruits);

String de-weight method:

The use of regular

/**
* String de-weight
* \ r \ n String delimiter
* The index of the split string, the $ $ string
* Split the string with a delimiter and cycle through the number of elements of the split array
*/
function Strunique () {
var str = "ABC, ABCD, ABC, ABCDE, ABCD, ABCDE";
var ret = [];
Str.replace (/[^,]+/g, function ($, $) {
(Str.indexof ($) = = $) && Ret.push ($);
});
alert (ret);
return ret;
}

1     functionStrunique () {2         varstr = "ABC, ABCD, ABC, ABCDE, ABCD, ABCDE";3         varRET = [];4Str.replace (/[^,]+/g,function($, $){5(Str.indexof ($) = = $) && Ret.push ($);6         });7 alert (ret);8         returnret;9     }Ten      OneStrunique ();

JS Array and string to repeat several methods