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Promise vs Array
(version: 1)
Comparing performance of:
Promise vs Array vs Nothing
Created:
9 years ago
by:
Registered User
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Tests:
Promise
let returnPromise = Promise.resolve(); for (let i = 0; i < 15; i++) { for (let j = i + 1; j <= 15; j++) { const execResult = Promise.resolve(123); returnPromise = returnPromise.then(execResult); } }
Array
let execs = []; for (let i = 0; i < 15; i++) { for (let j = i + 1; j <= 15; j++) { const execResult = Promise.resolve(123); execs.push(execResult); } } Promise.all(execs)
Nothing
for (let i = 0; i < 15; i++) { for (let j = i + 1; j <= 15; j++) { const execResult = Promise.resolve(123); } }
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Suite status:
<idle, ready to run>
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Test case name
Result
Promise
Array
Nothing
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Overview** The provided benchmark is designed to compare the performance of using `Promise` versus `Array` for executing multiple asynchronous operations in JavaScript. **Options Compared** Two options are compared: 1. **Promise**: Uses `Promise.resolve()` to create a promise that resolves with a value (in this case, 123) after each iteration. 2. **Array**: Uses an array `execs` to store promises, and then uses `Promise.all()` to execute all the promises in the array. **Pros and Cons** * **Promise**: + Pros: Efficient use of promise chaining, allows for easy handling of errors and cancellations. + Cons: Can lead to performance issues if not optimized properly (e.g., creating too many promises), and can be less intuitive for developers who are not familiar with promises. * **Array**: + Pros: Can be more intuitive for developers who are used to working with arrays, allows for easy parallel execution of operations. + Cons: Requires using `Promise.all()`, which can lead to performance issues if the array is large. **Library and Syntax** None. However, it's worth noting that `Promise` is a built-in JavaScript feature that was introduced in ECMAScript 2015 (ES6). If you're not familiar with promises, I can explain more about them! **Other Considerations** * The benchmark uses a simple loop to iterate over the range of numbers from 0 to 15. This means that the performance differences between Promise and Array will be less noticeable for larger ranges. * The benchmark doesn't account for errors or cancellations, which could affect the results. **Alternatives** Other alternatives to compare in similar benchmarks might include: 1. **Callback-based approach**: Using traditional callback functions instead of promises or arrays. 2. **Async/Await**: Using async/await syntax instead of promises or arrays. 3. **Web Workers**: Using web workers to execute multiple tasks concurrently, which can provide better performance for large datasets. These alternatives would require additional modifications to the benchmark definition and test cases.
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