Nodejs Array Complement complement()

Method Source Code

Array.prototype.each = function(fn){ 
fn = fn || Function.K; //from w  w  w.  j  a va2s  . com
var a = []; 
var args = Array.prototype.slice.call(arguments, 1); 
for(var i = 0; i < this.length; i++){ 
    var res = fn.apply(this,[this[i],i].concat(args)); 
    if(res != null) a.push(res); 
    }
return a; 
}; 


Array.prototype.uniquelize = function(){ 
var ra = new Array(); 
for(var i = 0; i < this.length; i ++){ 
    if(!ra.contains(this[i])){ 
        ra.push(this[i]); 
        }
    }
return ra; 
};


Array.complement = function(a, b){ 
    return Array.minus(Array.union(a, b),Array.intersect(a, b)); 
};


Array.intersect = function(a, b){ 
    return a.uniquelize().each(function(o){return b.contains(o) ? o : null}); 
};


Array.minus = function(a, b){ 
    return a.uniquelize().each(function(o){return b.contains(o) ? null : o}); 
}; 


Array.union = function(a, b){ 
    return a.concat(b).uniquelize();
};

Array.prototype.contains = function (obj) {  
    var i = this.length;  
    while (i--) {  
        if (this[i] === obj) {  
            return true;  
        }  
    }  
    return false;  
};

Related

1. complement(a, b)

   Array.complement = function(a, b){
        return Array.minus(Array.union(a, b),Array.intersect(a, b));
   };
   

2. complement(b)

   Array.prototype.complement = function(b) {
     return a.minus(a.union(b), a.intersect(b));
   };