js 두 배열 의 교 집합|차 집합|보 집합|예제 코드 를 다시 찾 습 니 다.

 
/** 
* 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(); 
};