tipCalculator.js

/*
Complete the function, which calculates how much you need to tip based on the total amount of the bill and the service.

You need to consider the following ratings:

Terrible: tip 0%
Poor: tip 5%
Good: tip 10%
Great: tip 15%
Excellent: tip 20%
The rating is case insensitive (so "great" = "GREAT"). If an unrecognised rating is received, then you need to return:

"Rating not recognised" in Javascript, Python and Ruby...
...or null in Java
...or -1 in C#
Because you're a nice person, you always round up the tip, regardless of the service.
*/

//Answer//

function calculateTip(a, r) {
switch(r.toLowerCase()){
case 'terrible': return 0;
break;
case 'poor': return Math.ceil(a/20);
break;
case 'good': return Math.ceil(a/10);
break;
case 'great': return Math.ceil(a*0.15);
break;
case 'excellent': return Math.ceil(a/5);
break;
default: return "Rating not recognised"

}
}