es6_arrow_iife.js

// IIFE: With Arrow Function
// The arrow function is called immediately with a list of arguments
// and the return value is assigned to the `compute` variable

const compute = ((...numbers) => {

  // Private members
  
  const length = numbers.length;
  const min = Math.min(...numbers);
  const max = Math.max(...numbers);
  
  const sum = numbers.reduce((a, b) => a + Number(b), 0);
  
  // Expose an inteface of public methods
  
  return {
    sum: () => sum,
    avg: () => sum / length,
    range: () => max - min
  };
  
})(42, 68, 49, 83, 72, 65, 77, 74, 86, 51, 69, 47, 53, 58, 51);


// Access the exposed public methods

console.log(compute.sum()); // 945
console.log(compute.avg()); // 63
console.log(compute.range()); // 44