class calculator {
        constructor(){
          this.calcTitle = document.getElementsByClassName("calculator-title");
          this.calcSection = document.getElementsByClassName("calculator-info");
        }
        hidetabcontect(){
            for (var i = 0; i < this.calcTitle.length; i++) {
              this.calcSection[i].style.display = "none";
              this.calcTitle[i].classList.remove("active");
            }
        }
        tabcalc(){
            for (let i = 0; i < this.calcTitle.length; i++) {
              this.calcTitle[i].addEventListener("click", (e) => {
                   e.preventDefault();
                   hidetabcontect();
                   this.calcTitle[i].classList.add("active");
                   $(`.calculator-info:eq(${i})`).fadeTo("slow", 1);
               })
            }
        };
}
let calculatorOne = new calculator();
calculatorOne.tabcalc();