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//BASIC PIECES, 3 functions: unit, bind and the bind argument | |
//function unit(value) | |
//function bind(monad, function(value)) | |
//all three functions return a monad | |
/* The unit function is a constructor (returns a monad object) | |
* The magic is in the bind function | |
* | |
* There are AXIOMS: | |
* bind(unit(value)), f) === f(value) |