JSFiddle - React, Tailwind, and code Playground

HTML

<div class="output"></div>

JavaScript

Array.prototype.range = function() {

    var min = null,
        max = null,
        i, len;

    for (i = 0, len = this.length; i < len; ++i)
    {
        var elem = this[i];
        if (min === null || min > elem) min = elem;
        if (max === null || max < elem) max = elem;
    }

    return { min: min, max: max }
};

var foo = [3, 9, 22, -7, 44, 18, 7, 9, 15];

var range = foo.range();

$('.output').append('<h1>Min</h1><p>' + range.min + '</p>')
             .append('<h1>Max</h1><p>' + range.max + '</p>');