Find Min and Max Number

/* Write a JavaScript function findMinAndMax(arr) that accepts as parameter an array of numbers.
The function finds the minimum and the maximum number. Write a JS program minMaxNumbers.js
that invokes your function with the sample input data below and prints the output at the console. */

"use strict";

var result = {};
function findMinAndMax(arr) {
    arr = arr.sort(function(a, b) {
        return a - b;
    });

    result = {
        'Min': arr[0],
        'Max': arr[arr.length - 1]
    };
}

findMinAndMax([1, 2, 1, 15, 20, 5, 7, 31]);
console.log('Min -> ' + result.Min);
console.log('Max -> ' + result.Max);

findMinAndMax([2, 2, 2, 2, 2]);
console.log('Min -> ' + result.Min);
console.log('Max -> ' + result.Max);

findMinAndMax([500, 1, -23, 0, -300, 28, 35, 12]);
console.log('Min -> ' + result.Min);
console.log('Max -> ' + result.Max);

findMinAndMax([0.3, 5.4, 12.6, 8.5, 2.4, 1.8, 3.6, 10.7, 1.1, 2, 7.2, 0, -0.9, -1.6, 10]);
console.log('Min -> ' + result.Min);
console.log('Max -> ' + result.Max);

findMinAndMax([]);
console.log('Min -> ' + result.Min);
console.log('Max -> ' + result.Max);