areaOfCircle-- a value-returning function that accepts one argument.
// jshint esversion: 6
//define the function
function areaOfCircle(radius){
return Math.PI * radius ** 2;
}
//test the function
//declare variables
let radius1, radius2, area1, area2;
//assign inputs
radius1 = 1;
radius2 = 5;
//call the function
area1 = areaOfCircle(radius1); //unit circle makes a good test
area2 = areaOfCircle(radius2);
//output the results
console.log("area1 = " + area1 + " area2 = " + area2);
alert("area1 = " + area1 + " area2 = " + area2);