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then vs. async-await simple
(version: 0)
Comparing performance of:
then vs async-await
Created:
2 years ago
by:
Guest
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Tests:
then
let result = 0 function one() { return new Promise((resolve, reject) => { return resolve(`hi`); }); } function khw() { one().then((message) => result += message); } khw();
async-await
let result = 0 function one() { return new Promise((resolve, reject) => { return resolve(`hi`); }); } async function khw() { result += await one(); } khw();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
then
async-await
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided JSON represents a JavaScript microbenchmark test created on MeasureThat.net. The benchmark compares the performance of two approaches: using the traditional `then` method with callbacks and asynchronous functions (async-await) for handling promises. **Script Preparation Code** There is no script preparation code provided in the JSON, which means that the benchmark setup is likely handled automatically by the MeasureThat.net platform. **Individual Test Cases** The test cases are defined as two separate JavaScript code snippets: 1. **`then` Method**: This code snippet uses a callback function within a promise to resolve a value (`"hi"`). The `then` method is used to handle this resolved value, and it increments a variable `result`. 2. **Async-Await Approach**: Similar to the first test case, but instead of using the `then` method, an async function is defined that uses the `await` keyword to wait for the promise to resolve and then assigns the returned value to another variable (`result`). **Comparison** The two approaches differ in how they handle the asynchronous nature of promises. The traditional `then` method with callbacks requires manual handling of error cases (via `reject`) and can lead to callback hell, making code harder to read and maintain. On the other hand, async-await provides a more concise and readable way to write asynchronous code by allowing you to use synchronous-looking syntax (`await` keyword) within asynchronous functions. However, it introduces a new context for handling errors (within the `try-catch` block). **Pros and Cons** * **Traditional `then` Method:** + Pros: - Simple and widely supported + Cons: - Can lead to callback hell and harder-to-read code - Error handling can be cumbersome * **Async-Await Approach:** + Pros: - More concise and readable - Better support for error handling within the `try-catch` block + Cons: - May require additional setup (e.g., installing a linter) - Some browsers might not fully support it **Library** There is no library explicitly mentioned in the code snippets, as they only utilize built-in JavaScript features. **Special JS Features or Syntax** The benchmark uses async-await syntax, which was introduced in ECMAScript 2017 (ES7). This allows developers to write asynchronous code that is more readable and easier to maintain. **Other Alternatives** If you're interested in exploring other approaches for handling promises in JavaScript, consider the following alternatives: * **Promise-Chaining**: Using multiple `then` methods to chain together asynchronous operations. * **Promises with `.catch()`**: Handling errors within a promise by using the `.catch()` method. * **Generators and Iterators**: Using generators and iterators to handle asynchronous operations. Keep in mind that each approach has its trade-offs, and the choice ultimately depends on your specific use case and performance requirements.
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