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3-failed.js
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41 lines (35 loc) · 777 Bytes
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'use strict';
const future = (executor) => ({
chain(fn) {
return future((resolve, reject) =>
this.fork(
(value) => fn(value).fork(resolve),
(error) => reject(error),
),
);
},
map(fn) {
return this.chain((value) => future.of(fn(value)));
},
fork(successed, failed) {
executor(successed, failed);
return this;
},
});
future.of = (value) => future((resolve) => resolve(value));
// Usage
future((resolve, reject) => reject(new Error('Rejected')))
.map((x) => {
console.log('future1 started');
return x;
})
.map((x) => ++x)
.map((x) => x ** 3)
.fork(
(value) => {
console.log('future result', value);
},
(error) => {
console.log('future failed', error.message);
},
);