CodeSkill2-3.js

var tablica_1 = [1,2,3,4,6],
	tablica_2 = [3,1,5,6],
	tablica_3 = [3,1,2,3,6],
    	tablica_4 = [3,5,6];

function findCommonElements (){
	var argumentsArray = arguments;
	var result = arguments[0].filter(function(value) { 
		var isEqual = true;
			for(var i = 1 ; i < argumentsArray.length ; i++){
				if(argumentsArray[i].indexOf(value) < 0)  isEqual = false;
			}
		return isEqual;
	});
	console.log(result);
}

//test
findCommonElements (tablica_1,tablica_2,tablica_3);
findCommonElements (tablica_1,tablica_2,tablica_3,tablica_4);