buzzdecafe

// Paul's clean-up

function deDupe(dupeCheck, list) {
    return list.reduce(function (prev, curr) {
        if (!dupeCheck(curr, prev)) {
            prev.push(curr);
        }
        return prev;
    }, []);
}

buzzdecafe

function recur(fn) {
    return function () {
        var bounce = fn.apply(this, arguments);
        while (bounce.onTheTrampoline) {
            bounce = bounce();
        }
        return bounce;
    };
}
var sum1 = recur(function sum(x, y) {

buzzdecafe

// clean and pure:
function cons(x, y) {
    return function(pick) {
        return pick(x, y);
    }
}

// does more stuff:
function cons(x, y) {
    var fn = function(pick) {