javascript常用配列ツールの集合

/**
* each         ，                   
*                              ，           
{%example
<script>
     var a = [1,2,3,4].each(function(x){return x > 2 ? x : null});
     var b = [1,2,3,4].each(function(x){return x < 0 ? x : null});
     alert(a);
     alert(b);
</script>
%}
* @param {Function} fn          
* @param more ...                
* @returns {Array}    ，      ，    
*/
Array.prototype.each = function(fn){
    fn = fn || Function.K;
     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;
};
/**
*               <br/>
*        
* @returns {Array}            
*/
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;
};
/**
*         
{%example
<script>
     var a = [1,2,3,4];
     var b = [3,4,5,6];
     alert(Array.complement(a,b));
</script>
%}
* @param {Array} a   A
* @param {Array} b   B
* @returns {Array}        
*/
Array.complement = function(a, b){
     return Array.minus(Array.union(a, b),Array.intersect(a, b));
};
/**
*         
{%example
<script>
     var a = [1,2,3,4];
     var b = [3,4,5,6];
     alert(Array.intersect(a,b));
</script>
%}
* @param {Array} a   A
* @param {Array} b   B
* @returns {Array}        
*/
Array.intersect = function(a, b){
     return a.uniquelize().each(function(o){return b.contains(o) ? o : null});
};
/**
*         
{%example
<script>
     var a = [1,2,3,4];
     var b = [3,4,5,6];
     alert(Array.minus(a,b));
</script>
%}
* @param {Array} a   A
* @param {Array} b   B
* @returns {Array}        
*/
Array.minus = function(a, b){
     return a.uniquelize().each(function(o){return b.contains(o) ? null : o});
};
/**
*         
{%example
<script>
     var a = [1,2,3,4];
     var b = [3,4,5,6];
     alert(Array.union(a,b));
</script>
%}
* @param {Array} a   A
* @param {Array} b   B
* @returns {Array}        
*/
Array.union = function(a, b){
     return a.concat(b).uniquelize();
};