#javascript

differenc between two objects.js

function arr_diff (a1, a2) {

    var a = [], diff = [];

    for (var i = 0; i < a1.length; i++) {
        a[a1[i]] = true;
        // a = [a: true, b: true, x: true]
       // console.log(a1[i]);
    }
    //console.log(a);
	//return 'finish 1';
    for (var i = 0; i < a2.length; i++) {
        if (a[a2[i]]) {
        console.log('ariso da cavshlio  ' + a2[i]);
            delete a[a2[i]];
        } else {
            a[a2[i]] = true;
            console.log('ar arisooooo  ' + a2[i]);
        }
    }
     console.log(a);
	return 'finish 2';
    for (var k in a) {
        diff.push(k);
    }
	return 'finish 3';
    //return diff;
}
console.log(arr_diff(['a', 'b','x'], ['a', 'b', 'c', 'd']));
/* console.log(arr_diff(['a', 'b'], ['a', 'b', 'c', 'd'])); */
/* console.log(arr_diff("abcd", "abcde")); */
/* console.log(arr_diff("zxc", "zxc")); */

*********************** version two *************************************************************
function arr_diff (a1, a2) {

    var a = [], b = [], diff = {}, detach = [], attach = [];
  
        for(var key in a1) {
           a[key] = true;
        }

       for(var key in a2) {
            
             b[key] = true;
       }

       for(var key in a2) {
        
           if (a[a2[key]]) {
             delete a[a2[key]];
           }else{
                a[a2[key]] = true;
                attach.push(a2[key]);
           }
        
       }
      
      for(var key in a1) {
  
        if(b[a1[key]]) {
     
           
        } else {
            //a[a2[i]] = true;
            detach.push(a1[key]);
        } 
    
   }
   
    diff.detach = detach; 
    diff.attach = attach;

return diff;
  
}