JavaScript-from-Beginner-to-Professional/chapter 6/ex 3

        const val1 = 10;
        const val2 = 5;
        const myArr = [];

        for(let x=0;x<10;x++){
            let val1 = 5 * x;
            let val2 = x * x;
            let res = cal(val1, val2);
            myArr.push(res);
        }
        console.log(myArr);
        function cal(a, b, op) {
            if (op == "-") {
                return a - b;
            } else {
                return a + b;
            }
        }