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// Sometimes you'll need a value type; for representing a point, or other values
// which are fully defined after construction. If we take the example of a point:

class Point {
    constructor(public x: number, public y: number) {
        return Object.freeze(this);
    }
}

let p = new Point(3, 4);

wkronemeijer

this.iter = function iter(array) {
    var copy = array.slice();
    var i    = 0;
    var max  = copy.length - 1;
    
    var next = function next() {
        var index = i
        i += 1
        
        if (index > max) {

wkronemeijer

function parseHeader(letters: string): number {
    function letterValue(letter: string): number {
        return parseInt(letter, 36) - 9
    }
    
    let result = 0
    let factor = 1
    
    if (letters.length === 1) {
        result = letterValue(letters[0])

wkronemeijer

Array.prototype.contains = function(element) {
    return this.indexOf(element) !== -1;
};

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function hasClass(element, class_name) {
   return element.classList.contains(class_name);
}

function addClass(element, class_name) {
    if (!hasClass(element, class_name)) {
        element.classList.add(class_name)
    };
}

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function KeyboardController(keys, repeat) {
    var timers = {};

    document.addEventListener('keydown', function(event) {
        var key = event.keyCode;
        if (!(key in keys))
            return true;
        if (!(key in timers)) {
            timers[key] = null;
            keys[key](event);

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function augment(obj, function_name, new_function) {
    var original = obj[function_name];
    obj[function_name] = function () {
        new_function.bind(this, original).apply(this, arguments);
        original.bind(this).apply(this, arguments);
    };
}

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Array.prototype.remove = function (element) {
    while (this.contains(element)) {
        this.splice(this.indexOf(element), 1);
    }
}

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window.assert = function assert(condition) {
    if (!condition) {
        debugger;
    };
};

wkronemeijer

window.call_super = function call_super(obj, name) {
    var super_class = Object.getPrototypeOf(Object.getPrototypeOf(obj));
    return (function () {
        super_class[name].apply(obj, arguments);
    })
}