ZADANIE 1 ////////////////////////////////////
var calculator =
    {
        save: function(newN)
        {
            this.n = newN;

        },
        sqrt: function()
        {
            return Math.sqrt(this.n);
        },

    };

calculator.save(25);
console.log( calculator.sqrt() );


ZADANIE 3  /////////////////////////////////////////




function biggestSumOfTwoElements(arr) {

    if(arr.length === 0){
        return "pusta tablica"
    }else if (arr.length === 1){
        return arr[0]
    }

    let result = 0;
    result+=Math.max(...arr);
    arr.splice(arr.indexOf(Math.max(...arr)));
    result+=Math.max(...arr);
    return result

}
console.log(biggestSumOfTwoElements([1,2,3,4]));