JSFiddle - React, Tailwind, and code Playground

HTML

<button>foo</button>
    <span id="info"></span>

CSS

#info {
    color: red;
}

JavaScript

function getAvg(arr) {
    // skipped type check
    var avg = 0;
    for(var i = 0, len = arr.length; i < len; i++) {
        avg += arr[i];
    }
    return (avg / arr.length);
};

$('button').click((function() {
        var history = [],
            last = +new Date();

        return function(e) { 
            history.push(e.timeStamp - last);
            
            if( getAvg(history) < 450 ) {
                $('#info').text('You are like a machine?!?');
            }
            else {
                $('#info').text('');
            }
            
            last = e.timeStamp;
        };
    }()));