[cyber]

попробуй ты, а то я что то уже нехрена не пойму.

function compare(fArr,arr) {
    
    var search = arr.slice(),
        insert = [],
        remove = [],
        replace = [],
        leng = fArr.length;
    
    for(var i = 0, index; i < leng; i++) {
        
      if(fArr[i] === arr[i]){
        
      search[i] = undefined;
       continue;
      }
        
          
        index = search.indexOf(fArr[i]);

        if(!~index) {
          
            remove.push(i);
            continue;
        }
        
       i != index && replace.push({old: i, new: index});
        
         search[index] = undefined;

        };
  
    
    for(i = 0, leng = search.length; i < leng; i++ ) {
        if(search[i] !== undefined)
          insert.push(i);     
    };
    
    return {
        remove: remove,
        insert: insert,
        replace: replace
    }
    
}

function compare(fArr,arr) {
    
    var search = arr.slice(),
        insert = [],
        remove = [],
        replace = [],
        leng = fArr.length;
    
    for(var i = 0, index; i < leng; i++) {
        
      if(fArr[i] === arr[i]){
        
      search[i] = undefined;
       continue;
      }
        
          
        index = search.indexOf(fArr[i]);

        if(!~index) {
          
            remove.push(i);
            continue;
        }
        
       i != index && replace.push({old: i, new: index});
        
         search[index] = undefined;

        };
  
    
    search.forEach(function (elem, i) {
        if(elem !== undefined)
          insert.push(i);     
    });
    
    return {
        remove: remove,
        insert: insert,
        replace: replace
    }
    
}