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#1 19/11/2012 18h56

Oliv
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Lieu : Grenoble
Inscription : 14/03/2012
Messages : 3

[JS] Instanciations et portées en javascript

Bonjour à tous,

voila un petit mémo des possibilités d'instanciations et portées des variables en javascript.

Généralités

En javascript, toutes les variables sont par défaut rattachées à l'élément conteneur de la page (window). De manière à éviter les collisions de noms, il est conseillé lors de la rédaction d'un script d'utiliser l'équivalent d'un namespace, une fonction anonyme auto-executée (l'auto-execution s'effectue grâce au "()" en fin de fonction) dans laquelle les variables déclarées n'auront par défaut aucune influence sur l'environnement window. Il est cependant possible d'accéder à tout moment à l'objet window en omettant le mot clé var :

var foo = 'window context';

(function() {
    var foo = 'function context, window context unchanged';
})()
// foo unchanged

(function() {
    foo = 'access to window context while in function';
})()
// foo changed

exemple : http://jsfiddle.net/oliv/3Rcmn/1/

Deux méthodes sont possibles pour déclarer une fonction :

function foo() {}

ou

var foo = function() {}

La première méthode est toujours interprétée en premier par javascript peu importe sa place dans le code. il est donc possible d'appeler la fonction déclarée plus loin dans le code. En cas de double déclaration, ce sera toujours la dernière fonction déclarée qui sera utilisée, pouvant générer des soucis de conception :

var foo = 1;

function bar() {
    foo++;
}

bar();
// foo = 0

function bar() {
    foo--;
}

exemple : http://jsfiddle.net/oliv/3Rcmn/2/
On pourrait ici s'attendre à obtenir foo = 2, cependant la redéclaration de la fonction écrase la première et donne donc un foo = 0.

La deuxième méthode fait pointer la fonction vers une variable, et n'existera donc pas avant sa définition. Elle représente cependant la fonction définie à l'instant t, supprimant les soucis comportementaux potentiels :

var foo = 1;

var bar = function() {
    foo++;
}

bar();
// foo = 2

var bar = function() {
    foo--;
}
    
bar();
// foo = 1

exemple : http://jsfiddle.net/oliv/3Rcmn/3/

Méthodes statiques, publiques et privées, par prototypage

Les méthodes "statiques" en javascript sont des éléments accessibles sans besoin d'instancier l'objet. Elles ne sont pas contenues dans le prototype de la fonction. Il est uniquement possible d'accéder au même type de méthodes/variables au sein de celles-ci :

var foo = function() {
    var privateVar = 'private';
    this.publicVar = 'public';
}
foo.staticVar = 'static';

(foo.bar = function() {
    // foo.staticVar = 'static'
    // privateVar undefined
    // this.publicVar undefined
})()

exemple : http://jsfiddle.net/oliv/3Rcmn/5/

Les méthodes "publiques" nécessitent d'instancier l'objet. Elles sont contenues dans le prototype de la fonction, créé au moment de l'utilisation du mot clé "new". Dans ce cas, le corps de la fonction de base joue le rôle de constructeur de l'objet (contenu après instanciation dans prototype.contructor) :

var foo = function(arg) {
    // Constructor run during "new"
    var privateVar = 'private';

    // "this" can be used now, refers to fn.prototype
    this.publicVar = arg;
}
foo.staticVar = 'static';

foo.prototype.bar = function() {    
    foo.staticVar = 'new static var';
}

var instance = new foo('public');
// foo.staticVar = 'static'
// privateVar undefined
// this.publicVar = 'public'

var instance2 = new foo('public2');
instance2.bar();
// foo.staticVar = 'new static var'
// privateVar undefined
// this.publicVar = 'public2'

instance.bar();
// foo.staticVar = 'new static var', changed
// privateVar undefined
// this.publicVar = 'public', unchanged

exemple : http://jsfiddle.net/oliv/3Rcmn/7/
A noter que le changement de la variable statique impacte sa valeur pour toutes les instances de foo.

La variable privée déclarée par le mot clé "var" existe ici uniquement dans le constructeur de l'objet.

Différenciation des méthodes statiques et publiques

Tous les objets ont une méthode .hasOwnProperty() permettant de tester les variables directement rattachées à l'objet, excluant ainsi les propriétés provenant du prototype.

Héritage

Il est possible de simuler l'héritage d'objets en javascript. Voici la démarche :

var foo = function(arg) {
    // Parent constructor
    this.publicVar = arg;
};

// Parent vars & methods
foo.prototype = {
    publicVar: {},
    fn: function() {
        return this.publicVar;
    }
};

var bar = function(arg) {
    // Call parent constructor
    this.__parent(arg);
    
    // Child constructor
    this.fn();
};

// Get parent methods
bar.prototype = foo.prototype;
// Override parent constructor with child
bar.prototype.constructor = bar;
// Store parent contructor in .__parent() function
bar.prototype.__parent = foo;

var instance = new bar({});

exemple : http://jsfiddle.net/oliv/3Rcmn/10/

Voici le premier jet, je compléterai au fur et à mesure wink


Maîtrise de JS et JavaScript obligatoire.

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#2 23/02/2017 19h52

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Messages : 1

Re : [JS] Instanciations et portées en javascript

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#3 11/04/2017 5h29

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Messages : 14

Re : [JS] Instanciations et portées en javascript

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#4 12/04/2017 6h16

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Re : [JS] Instanciations et portées en javascript

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Re : [JS] Instanciations et portées en javascript

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#7 17/04/2017 14h30

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Re : [JS] Instanciations et portées en javascript

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Re : [JS] Instanciations et portées en javascript

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Re : [JS] Instanciations et portées en javascript

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#10 05/05/2017 7h16

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Re : [JS] Instanciations et portées en javascript

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#11 10/05/2017 1h41

Kennethsilla
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Re : [JS] Instanciations et portées en javascript

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#12 16/05/2017 5h19

DavidCem
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Re : [JS] Instanciations et portées en javascript

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#13 16/05/2017 6h13

DavidCem
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Re : [JS] Instanciations et portées en javascript

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#14 17/05/2017 7h39

DavidCem
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#15 17/05/2017 15h12

DavidCem
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Re : [JS] Instanciations et portées en javascript

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#16 04/06/2017 1h36

XRumerTest
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Re : [JS] Instanciations et portées en javascript

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#17 29/06/2017 8h26

STK-Monolitmon
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Re : [JS] Instanciations et portées en javascript

Какая марка бетона? От чего зависит стоимость разных марок?
Переоценить значение бетона в строительстве невозможно. Без него не обходится практически ни одна стройка. Разобраться в марках бетона и определить потребности для определенных задач, нам как раз поможет данная статья.
Бетон, как известно, это смесь вяжущего, заполнителя и воды. Мы будем рассматривать бетон цементный (бывает еще и нецементный, например, силикатный) с заполнителем из песка и щебня (гравия).
Основной показатель — марка бетона по прочности (М50, М100, М200, М300, М350, М400 и так далее). Это среднее значение прочности используется в основном «частниками».
В проектных документах, как правило, указывается класс прочности бетона (гарантированное значение).

Марка бетона / обозначение
М100    В7,5
М150    В10
В12,5
М200    В15
М250    В20
М300    В22,5
М350    В25

Каждая марка бетона имеет конкретную область применения. Схематично это можно представить в таблице.
Назначение    М100    М150    М200    М250    М300    М350
Бетонная подготовка    +    +
Стяжка пола         +    +
Фундамент              +    +    +    +
Лестницы                   +    +
Несущие конструкции                        +    +
Перекрытия                             +
Бассейны                             +

Как видим, для самого частого «потребителя» бетона — фундамента — вилка составляет от М200 до М350. Бетон М200 — самый распространенный, он чаще всего используется для ленточных фундаментов, М250 и М300 применяется на слабых грунтах, М350 используется для фундаментов промышленных объектов.


Теперь, давайте разберемся, сколько должен стоить один кубометр хорошего бетона по стандартам ГОСТ, который вполне достоин быть доставленным на объект с паспортом качества.

Цена на бетон зависит от:
1.    Стоимости компонентов (песок, цемент, вода, наполнители);
2.    Наличия добавок;
3.    Марки (класса);
4.    Производителя;
5.    Сезона.

Самым дорогим компонентом в бетоне является цемент. Его содержание и марка напрямую влияют на получаемую марку (класс) бетона. Напомним, чем выше марка, тем выше прочность. Естественно бетон более высокой марки обойдется дороже.

Песок, гравий, щебень и др. наполнители должны быть тщательно очищены от грязи и других примесей во избежание снижения прочности бетона. Дополнительная очистка приводит к удорожанию получаемой смеси.

Сама по себе бетонная смесь отлично подходит для строительства различных конструкций, но существуют случаи, когда необходимо улучшить определенные качества раствора. На помощь приходят добавки. Существует множество добавок для бетона, улучшающих различные свойства раствора:
•    подвижность;
•    пластичность;
•    водоудержание;
•    скорость твердения;
•    морозостойкость

И еще множество свойств. И снова, это ведет к удорожанию смеси….
Вы спросите нас - получается хороший бетон не может стоить дешево?... К сожалению наш ответ - да…
И мы хорошо понимаем, что одинаковые с виду консистенции разных марок бетона, могут иметь не только разную марочную прочность, но и не содержать столь необходимых по требованиям ГОСТ, добавок.

Стоит заметить и то, что весной цена на бетон резко возрастает с началом активизации строительного сезона (заводам нужно покрывать зимние убытки). Летом также дорожает и доставка, т.к. повышаются цены на топливо.

При покупке основными ориентирами для выбора смеси являются класс (марка), а также подвижность (текучесть). Еще нужно обратить внимание на разницу в способах доставки. Доставка бетона с подвижностью П1 и П2 осуществляется самосвалами. Бетон с подвижностью П3 и П4 доставляется на бетоносмесителях (миксерах). Стоимость доставки при помощи бетоносмесителя выше, чем при помощи самосвала.

Как сэкономить при покупке бетона
Первый фактор, влияющий на стоимость бетона, заключается в удаленности завода от строительной площадки. С этим фактором, надеюсь, все понятно.
Другой способ снизить стоимость заключается в использовании более дешевых наполнителей. Именно наполнителей, а не цемента, т.к. от количества и качества цемента зависит прочность конструкции. Например, к щебню и песку можно добавить различный металлолом, который к тому же улучшит прочностные свойства раствора, бой чистого кирпича или бетонных конструкций.
Раз уж мы заговорили об экономии на бетоне, то следует ответить вот на такой вопрос: Что дешевле, покупать бетон или замешивать самому? Естественно, речь идет о частных застройщиках.
Бытует ошибочное мнение, что пару кубометров бетона легче приготовить самому. Но давайте посмотрим на минусы такого подхода:
1.    Компоненты (щебень, цемент, песок) нужно привезти, для этого заказывать отдельные машины;
2.    Нужно платить рабочим за замесы раствора;
3.    Раствор, приготовленный не в заводских условиях, с большой вероятностью не будет отвечать ожиданиям по прочности и однородности;
4.    Укладка раствора будет происходить этапами, т.к. бетономешалка у вас скорей всего одна и она не безразмерная.

Надеюсь, наша статья поможет вам сделать правильный выбор и возможно сэкономить на покупке бетона, не ухудшая его основные технические параметры, такие как – прочность, морозостойкость и влагостойкость.

Вы хотите купить бетон недорого? не теряя в качестве и стандартах?     Нашим основным видом деятельности, является производство и продажа бетона в Санкт-Петербурге и Ленинградской области строго по ГОСТ!.

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#18 18/09/2017 7h06

XRumerTest
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Re : [JS] Instanciations et portées en javascript

Hello. And Bye.

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