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future.js
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67 lines (57 loc) · 1.25 KB
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'use strict';
class Future {
#executor;
constructor(executor) {
this.#executor = executor;
}
static of(value) {
return new Future((resolve) => resolve(value));
}
chain(fn) {
return new Future((resolve, reject) =>
this.fork(
(value) => fn(value).fork(resolve, reject),
(error) => reject(error),
),
);
}
map(fn) {
return new Future((resolve, reject) =>
this.fork(
(value) =>
new Future((resolve, reject) => {
try {
resolve(fn(value));
} catch (error) {
reject(error);
}
}).fork(resolve, reject),
(error) => reject(error),
),
);
}
fork(successed, failed) {
this.#executor(successed, failed);
}
toPromise() {
const { promise, resolve, reject } = Promise.withResolvers();
this.fork(resolve, reject);
return promise;
}
toThenable() {
const then = (resolve, reject) => {
this.fork(resolve, reject);
};
return { then };
}
}
const futurify =
(fn) =>
(...args) =>
new Future((resolve, reject) => {
fn(...args, (err, data) => {
if (err) reject(err);
else resolve(data);
});
});
module.exports = { Future, futurify };