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class X {
    constructor(len) {
        let target = Object.create(new.target.prototype);

        let handler = {
            // handler stuff - special logic for "length" and integer properties
            // Otherwise, use target's properties
        };

        return Reflect.construct(Proxy, [target, handler], new.target);

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(function() { 'use strict';

function consume(observable, gen) {

    return new Promise((resolve, reject) => {
            
        if (typeof gen === "function") {
            // Prime the generator to accept values
            gen = gen();
            gen.next();

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function toObservable(asyncIter) {
    return new Observable(sink => {
    
        let abort = false;
        
        (async _=> {
            try {
                for async (let x of asyncIter) {
                    if (abort) return;
                    sink.next(x);

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function toObservable(asyncIter) {
    return new Observable(sink => {
    
        let abort = false;
        
        (async _=> {
            try {
                for async (let x of asyncIter) {
                    if (abort) return;
                    sink.next(x);

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async function* flattenStreams(asyncIterList) {

    function deferred() {
        let capability = {};
        capability.promise = new Promise((resolve, reject) => {
            capability.resolve = resolve;
            capability.reject = reject;
        });
        return capability;
    }

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Observable.from = function(iterable) {

    return new Observable((push, error, close) => {

        try { for (let x of iterable) push(x) }
        catch (x) { error(x) }
        finally { close() }
    });
};

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const unwrapSymbol = Symbol();

function Definitely(x) {

    if (x == null || !(unwrapSymbol in x))
        return x;
    
    return x[unwrapSymbol];
}

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/* Redefine jQuery methods as "raw" methods */

(function($) { "use strict";

function wrap(method) {

    return function() {

        var jq = $(this),
            result = jq[method].apply(jq, arguments);

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(function($) { "use strict";

function wrap(method) {

    return function() { 
    
        var jq = $(this),
            result = jq[method].apply(jq, arguments);
        
        if (result && result.constructor === $)

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Abstract References for ECMAScript

Overview and Motivation

Despite its functional programming facilities, ECMAScript exhibits a strong preference for object-oriented "left-to-right" composition using instance methods. Unfortunately, composition by means of instance methods requires that extensibility be achieved by adding function-valued properties to the object or a prototype ancestor of the object. This leads to the following difficulties: