How compare dinamic string in javascript

I need to compare two strings in a custom filter I created in angular . The problem is that the comparison is always false , and check the contents of both strings , length and type and are equal . I have dealt with localeCompare , "== " " === " but does not work. the strange thing is on the first part of if works fine and both parties did the same.

this is my code:

.filter('search',function(){
    return function(items,arguments){//arguments -> object {columns,parameters}
        var i=0,j=0,filtered=[],nmbStr="",comp="";
        for(i=0;i<items.length;i++){
            nmbStr = (items[i][arguments.columns[0]]).toString();
            nmbStr = nmbStr.substr(0,arguments.parameters[0].length);
            switch(arguments.parameters.length){
                case 1:
                    if( nmbStr === arguments.parameters[0])
                    filtered.push(items.slice(i,i+1)[0]);
                    break;
                case 2:
                    comp = (items[i][arguments.columns[1]]);
                    comp = comp.substr(0,arguments.parameters[1].length);
                    comp = comp.toLowerCase();
                    if( nmbStr === arguments.parameters[0] && comp === arguments.parameters[1]){
                        filtered.push(items.slice(i,i+1)[0]);//crea un nuevo objeto a partir del array no una referencia
                    }
                    break;
            }
        }
        return filtered;
    }
})

and I called like this:

$filter('search')(tempArray,{columns:['id','company_name'],parameters:['1052','in']});

please help me i don't not know what to do...