Created
October 19, 2022 17:57
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mapAsync
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import { PerformanceObserver, performance } from 'perf_hooks'; | |
import R from "ramda"; | |
const perfObserver = new PerformanceObserver((items) => { | |
items.getEntries().forEach((entry) => { | |
console.log(`${entry.name}: ${entry.duration}}`) | |
}) | |
}) | |
perfObserver.observe({entryTypes: ["measure"]}) | |
async function mapAsync<Type, ReturnedType>( | |
promiseFunc: (value: Type) => Promise<ReturnedType>, | |
values: Type[], | |
chunk = 3 | |
) { | |
const processChunk = processWithFunction<Type, ReturnedType>(promiseFunc); | |
const chunks = R.splitEvery(chunk, values); | |
return R.flatten(await R.reduce(processChunk, Promise.resolve([]), chunks)); | |
} | |
function processWithFunction<Type, ReturnedType>( | |
promiseFunc: (x: Type) => Promise<ReturnedType> | |
) { | |
return async (acc: Promise<ReturnedType[]>, chunkOfValues: Type[]) => { | |
performance.mark('start') | |
const resolved = await acc; | |
const outcome = await Promise.all( | |
chunkOfValues.map((chunk) => promiseFunc(chunk)) | |
); | |
resolved.push(...outcome); | |
performance.mark('end') | |
performance.measure('start-end', 'start', 'end') | |
console.log({resolved}) | |
return resolved; | |
}; | |
} | |
let callCount = 0 | |
async function callDB(val) { | |
return new Promise((resolve) => { | |
setTimeout(() => { | |
// console.log(`calling DB with value: ${val}`); | |
callCount++ | |
resolve(true); | |
}, 1000); | |
}); | |
} | |
mapAsync(callDB, R.range(0, 6),3).then((resolves) => console.log({resolves,callCount})); |
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