async function asyncFor(){ for (const x of [1, 2, 3]) { await new Promise(resolve => resolve(x > 0)); }}async function asyncPromiseAll() { await Promise.all([1, 2, 3].map(x => new Promise(resolve => resolve(x > 0)) ));}asyncFor()asyncPromiseAll()--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| asyncFor | |
| asyncPromiseAll |
| Test name | Executions per second |
|---|---|
| asyncFor | 3118235.2 Ops/sec |
| asyncPromiseAll | 1073934.8 Ops/sec |
Let's break down the provided benchmark and explain what is being tested.
Benchmark Overview
The benchmark compares two approaches to handling asynchronous operations in JavaScript: async for and Promise.all. The goal is to determine which approach is faster and more efficient.
Options Compared
The benchmark tests two options:
for loop with an await statement inside the loop to wait for each iteration.Promise.all method to execute an array of promises in parallel and waits for all of them to resolve.Pros and Cons
for loops.Library Usage
The benchmark uses the Promise class from the JavaScript standard library to create promises that resolve after a certain condition is met. The await keyword is also used to wait for the resolution of these promises.
Special JS Features/Syntax
This benchmark does not use any special JavaScript features or syntax beyond what is commonly used in modern JavaScript development.
Other Alternatives
There are other approaches to handling asynchronous operations, such as:
These alternatives may have different trade-offs in terms of readability, performance, and complexity compared to the async for and Promise.all approaches tested by this benchmark.
