tuple.js

function tuple(/* ... */) {
    var args = arguments;
    return function unpackTuple(f) {
        return f.apply(this, args);
    };
}

var t = tuple(1, 2, 3);

t(function (a, b, c) {
    return {a:a, b:b, c:c};
});
// => {a:1, b:2, c:3}

t(Array);  // Be careful with one-element tuples!
// => [a, b, c]