Translate from javascript to VBA

This one is beyond me.

I'm trying to work out the compass bearing of a direct (rhumb line, constant bearing) route between two points on a sphere using latitude and longitude in radians. I've found a formula online but don't understand a word of it:

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Someone much clevered than me has posted this in javascript:

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And I dont speak java. I vaguely get the first line but don't understand the var q = line at all. Does anyone speak Java in here?

And yes, I realise I've put a formula in [ code ] tags but it may as well be in code.....a 64bit encrypted code.

I'm not going to even try to understand the maths, but the js above can be written as the below, hope it makes more sense to you than me!

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