Functional Programming in JavaScript - 7

gistfile1.js

const CIRCLE = "circle";
const SQUARE = "square";
const RECTANGLE = "rectangle";

var getAreaFunction = function (shape) {
  return function () {
    switch (shape) {
      case CIRCLE:
        return Math.PI * arguments[0] * arguments[0];
        break;
      case SQUARE:
        return arguments[0] * arguments[0];
        break;
      case RECTANGLE:
        return arguments[0] * arguments[1];
        break;
    }
  };
};

var getAreaOfCircle = getAreaFunction(CIRCLE);
var getAreaOfSquare = getAreaFunction(SQUARE);
var getAreaOfRectangle = getAreaFunction(RECTANGLE);

console.log(getAreaOfCircle(50));
console.log(getAreaOfSquare(50));
console.log(getAreaOfRectangle(50, 20));