Nodejs Array Contain containsDuplicateValues()

Method Source Code

Array.prototype.containsDuplicateValues = function () {
    var map = {};
    for (var i = 0, size = this.length; i < size; i++) {
        var value = this[i];
        if (value != 0) {
            if (map[value]) {
                return true;
            }//from   ww w  .j a  v a2 s  .  c om
            map[value] = true;
        }
    }
    return false;
}

Related

1. containsArray(arr)

   Array.prototype.containsArray = function(arr) {
       for (var i = 0; i < this.length; ++i) {
           if (this[i].length == arr.length) {
               var j;
               for (j = 0; j < arr.length; ++j)
                   if (arr[j] != this[i][j])
                       break;
               if (j == arr.length)
                   return i;
   ...
   

2. containsArray(array)

   Array.prototype.containsArray = function(array){
       if(!this[0] || !this[0][0]) console.log('This function only works on 2 dimensional arrays!');
       for(let i=0; i<this.length; i++){
         if(this[i].sort().join(',') === array.sort().join(',')){
           return true
       return false;
   

3. containsBy(elem, formatElem, formatListElem)

   Array.prototype.containsBy = function(elem, formatElem, formatListElem) {
       formatElem = formatElem || function (elem) {return elem;};
       formatListElem = formatListElem || function (elem) {return elem;};
       var contained = false;
       angular.forEach(this, function(listElem){
           if(formatListElem(listElem) == formatElem(elem)){
               contained = true;
       });
   ...
   

4. containsByProp(propName, value)

   Array.prototype.containsByProp = function(propName, value){
     for (var i = this.length - 1; i > -1; i--) {
       var propObj = this[i];
         if(propObj[propName] === value) {
           return true;
   return false;
   

5. containsContentsOf(array)

   Array.prototype.containsContentsOf = function(array) {
       var contains = true;
       if(!array)
           contains = false;
       for(var item=0; item<array.length; item++){
           if(this.indexOf(array[item]) < 0)
               contains = false;
       return contains;
   ...
   

6. containsElementByProperty(chave,obj)

   Array.prototype.containsElementByProperty = function(chave,obj) {
       var i = this.length;
       while (i--) {
         if (angular.equals(this[i][chave], obj)) {
               return true;
       return false;
   };
   ...
   

7. Contains( value )

   Array.prototype.Contains = function( value )
       for ( var i = 0; i < this.length; i++ )
           if ( this[ i ] === value ) return true;
       return false;
   };
   

8. isContain(e)

   Array.prototype.isContain = function(e) {
     return this.indexOf(e) != -1;