Nodejs Array Remove Duplicate removeDuplicate()

Method Source Code

Array.prototype.removeDuplicate = function() {
   return this.reduce(function(last,current){
      if(last.indexOf(current) === -1){
         last.push(current);//from  w w w.ja  v a  2  s  .  c om
      }
      return last;
   },[])
};



var array = [1,1,2,1,3,4,12,4,5,,12,3,4];
var a = array.concat([]);
a = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})
console.log(a)

console.log(array.removeDuplicate());

Related

1. removeDuplicate()

   Array.prototype.removeDuplicate = function()
     var tmp = [];
     var agent = {};
     for( var i = 0; i < this.length; i++ )
       if( !agent.hasOwnProperty( this[ i ] ) )
         agent[ this[ i ] ] = { val: this[ i ], index: i };
     console.log( agent );
     for( var ns in agent )
       var d = agent[ ns ];
       tmp[ d.index ] = d.val;
     for( i = tmp.length - 1; i > 0; i-- )
       if( is_empty( tmp[ i ] ) ) tmp.splice( i, 1 );
     return tmp;
   };
   

2. removeDuplicateDates()

   Array.prototype.removeDuplicateDates = function() {
     var u = [];
     for ( var i = 0; i < this.length; i++ ) {
       var current = new Date(this[i]);
       if ( u.map(Number).indexOf(+current) < 0 ) {
         u.push(current);
     return u;
   ...
   

3. removeDuplicateValues()

   Array.prototype.removeDuplicateValues = function () {
       return this.filter(function (elem, pos, self) {
           return self.indexOf(elem) == pos;
       });
   

4. removeDuplicateValues()

   Array.prototype.removeDuplicateValues = function () {
       return this.filter(function (elem, pos, self) {
           return self.indexOf(elem) === pos;
       });
   };