Tuple

tuple.js

function Tuple(_1) {
    this.__1 = _1;
}
Tuple.prototype = {
    toString: function() {
        return "Tuple";
    }
};

function tuple1(value) {
    var tuple = Object.create(new Tuple(value));
    Object.defineProperty(tuple, "_1", {
        get: function() {
            return this.__1;
        },
        configurable: false
    });
    Object.freeze(tuple);
    return tuple;
}

function log(value){
    if(arguments.length) {
        console.log(value);
    } else {
        console.log(Array.prototype.slice.call(arguments).join(", "));
    }
}

var tuple = tuple1(1.23);

log(tuple);
log(tuple._1);
log(tuple instanceof Tuple);
log(Tuple.prototype.isPrototypeOf(tuple));​