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1.3 KiB
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| Dependency-Based Parallelization | CRITICAL | 2-10× improvement | async, parallelization, dependencies, better-all |
Dependency-Based Parallelization
For operations with partial dependencies, use better-all to maximize parallelism. It automatically starts each task at the earliest possible moment.
Incorrect (profile waits for config unnecessarily):
const [user, config] = await Promise.all([fetchUser(), fetchConfig()]);
const profile = await fetchProfile(user.id);
Correct (config and profile run in parallel):
import { all } from 'better-all';
const { user, config, profile } = await all({
async user() {
return fetchUser();
},
async config() {
return fetchConfig();
},
async profile() {
return fetchProfile((await this.$.user).id);
},
});
Alternative without extra dependencies:
We can also create all the promises first, and do Promise.all() at the end.
const userPromise = fetchUser();
const profilePromise = userPromise.then((user) => fetchProfile(user.id));
const [user, config, profile] = await Promise.all([userPromise, fetchConfig(), profilePromise]);
Reference: https://github.com/shuding/better-all