Comments (1)
Then implentation (grossly explanation)
Then will return a new Promise
In this promise the constructor will be wraped by a setTimeOut to respect asynchronous.
Donc on va essayer de jouer les 2 callbacks passés dans se setTimeOut (DO).
Mais seulement l'un des 2 callbacks va être joués, selon l'état de la promeses.
la 1er callback si on lui a passé un handle/then elle va retourner le resolve avec en paramètre la callback then + valeur si c'est pas une fonction alors on va resolve en passant directement le result de notre promise. // this if make to just play one the handlers and return the same result if the promises was already resolved and played handlers.
Second callback will do the same but for the handle error. (catch)
this.then = function (onFulfilled, onRejected) {
var self = this;
return new Promise(function (resolve, reject) {
return self.done(function (result) {
if (typeof onFulfilled === 'function') {
try {
return resolve(onFulfilled(result));
} catch (ex) {
return reject(ex);
}
} else {
return resolve(result);
}
}, function (error) {
if (typeof onRejected === 'function') {
try {
return resolve(onRejected(error));
} catch (ex) {
return reject(ex);
}
} else {
return reject(error);
}
});
});
}
function resolve(result) {
try {
var then = getThen(result);
if (then) {
doResolve(then.bind(result), resolve, reject)
return
}
fulfill(result);
} catch (e) {
reject(e);
}
}
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