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Assuming you're running the node server on a linux machine. You need to export all your environment variables manually or via a script like so: export PORT=3000;, then accesses them...

$(window).bind('scroll', function() {

    var dir = detectDirection();
    console.log(dir);

});

You were calling detectDirection() twice during each...

Use a double dash before arguments:

npm run test -- arg1 arg2 -f --flag2

ERB will output a plain string. JS needs inverted commas around a string for it to be recognized. You have missed them on your console.log() statement.

Change it to:

You just need to provide the data as an array of two element (key / value) arrays. Specify an innerSize to get the donut style.

So your parameters will contain something...