Nodejs Array Unique unique(fun, map)

Method Source Code

//Array/*from w ww  .j  a  va2s. co  m*/
(
   Array.prototype.unique = function (fun, map) {
      fun = fun || (function(c) { return c; });
      var arrayUnique = [this[0]], 
      arrayUniqueAtt = [fun(this[0])];
      this.forEach(function(el){
         if (arrayUniqueAtt.indexOf(fun(el)) === -1) {
            arrayUniqueAtt.push(fun(el));
            arrayUnique.push(el);
         }
      });
      return map ? arrayUniqueAtt : arrayUnique;
   }

Related

1. unique(a)

   Array.prototype.unique = function(a) {
       return function(){return this.filter(a)}}(function(a,b,c){return c.indexOf(a,b+1)<0
   });
   

2. unique(b)

   Array.prototype.unique = function(b) {
       var a = [], i, l = this.length;
       for (i = 0; i < l; i++) {
           if (a.indexOf(this[i], 0, b) < 0) {
               a.push(this[i]);
       return a;
   };
   ...
   

3. unique(b)

   Array.prototype.unique = function(b) {
     var a = [], i, l = this.length;
     for (i = 0; i < l; i++) {
       if (a.indexOf(this[i], 0, b) < 0) {
         a.push(this[i]);
     return a;
   };
   ...
   

4. unique(callback)

   Array.prototype.unique = function(callback) {
     var o = {}, i, l = this.length, r = [];
     for (i=0; i<l; i+=1) {
       var val = callback(this[i]);
       o[val] = this[i];
     for (i in o) {
       r.push(o[i]);
     return r;
   };
   

5. unique(data)

   Array.prototype.unique = function(data) {
     data.sort();
     var re = [ data[0] ];
     var length = data.length;
     for (var i = 1; i < length; i++) {
       if (data[i] !== re[re.length - 1]) {
         re.push(data[i]);
     return re;
   };
   

6. unique(k)

   Array.prototype.unique = function(k) {
       var self = this;
       var result = [];
       var sublen = 0;
       for (var i = 0, l = self.length; i < l; i++) {
           var v = self[i];
           if (!k) {
               if (result.indexOf(v) === -1) {
                   result.push(v);
   ...
   

7. unique(mutate)

   Array.prototype.unique = function (mutate) {
     var unique = this.reduce(function (accum, current) {
       if (accum.indexOf(current) < 0) {
         accum.push(current);
       return accum;
     }, []);
     if (mutate) {
       this.length = 0;
   ...
   

8. unique(str)

   Array.prototype.unique = function(str){
     const seen = new Map()
     return this.filter((a) => {
       return !seen.has(a['name']) && seen.set(a['name'], 1)
     })
   

9. unique1()

   Array.prototype.unique1 = function(){
     var res = [this[0]];
     for(var i = 1; i < this.length; i++){
       var repeat = false;
       for(var j = 0; j < res.length; j++){
         if(this[i] == res[j]){
           repeat = true;
           break;
       if(!repeat){
         res.push(this[i]);
     return res;
   var arr = [1, 'a', 'a', 'b', 'd', 'e', 'e', 1, 0]
   console.log(arr.unique1());