Variables of javascript.

// var firstName ="Shah Faisal"; // document.write(firstName); // let x ="faisal"; // document.write (x); // const z= "10"; // document.write(z); firstName="Qaiser Khan"; document.write (firstName); x="Muhammad Umar"; document.write(x); z="15"; document.write(z); var carmodel= "Corolla"; document.write(carmodel);