var pattern = require('pattern-js');

var work = 1,
    relax = 2,
    iceFishing = 3,
    bingo = 4,
    dancing = 5;
var bingoDay = "Fri";
var go = function(day) { console.log(day); };

var todo = pattern()
    .value("Mon", function() { go(work); })
    .value("Tue", function() { go(relax); })
    .value("Thu", function() { go(iceFishing); })
    .when(function(val) {  return val === "Fri" || val === "Sat"; },
            function(day) {
                if (day === bingoDay) {
                    go(bingo);
                    go(dancing);
                }})
    .value("Sun", function() { go(church); })
    .any(function() { go(work); })
    .matching();

todo("Fri") // usage

var detectZeroTuple = pattern()
    .value([0, 0], function() { console.log("Both zero"); })
    .some([0, undefined],
            function(var1, var2) { console.log("First value is 0 in (0, " + var2 + ")"); })
    .some([, 0],
            function(var1, var2) { console.log("Second value is 0 in (" + var1 + ", 0)"); })
    .any(function() { console.log("Both nonzero."); })
    .matching();
detectZeroTuple(0, 0);
detectZeroTuple(1, 0);
detectZeroTuple(0, 10);
detectZeroTuple(10, 15);