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Reduce vs map with Object.assign 1
(version: 1)
Comparing performance of:
Reduce vs Map with Object assign
Created:
3 years ago
by:
Registered User
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Tests:
Reduce
const answers = [ { "uuid": "38913ba2-98fa-48b3-bb2a-ac9d550a1e1a", "answers": [ { "questionUuid": "097707bb-c20d-41a5-8dad-22e2b54dcfd4", "value": "2022-06-04T12:00:00+01:00" }, { "questionUuid": "c6866d6f-dadf-457c-9ef5-4973b2c5d3b3", "value": "fdgsfdg" }, { "questionUuid": "95ddb5b6-1bdc-4e62-820c-6d8a135f5603", "value": "dfsfgsdg" } ] }, { "uuid": "a25f4908-bca2-40c7-8d4c-fefe81ce663c", "answers": [ { "questionUuid": "16a47c7f-707a-4b38-9538-3b38dab07314", "value": "dsadasdsdaa" } ] } ] const getInspectionEditInitialAnswers = (answers) => { return answers.map((answer)=>({[answer.questionUuid]: answer.value})) } const initialValues = answers.reduce((pageMemo, nextPageAnswer) => { if (nextPageAnswer.sections?.length) { return nextPageAnswer.sections.reduce( (sectionMemo, nextSectionAnswer) => ({ ...sectionMemo, [nextSectionAnswer.uuid]: { answers: getInspectionEditInitialAnswers(nextSectionAnswer.answers), }, }), {}, ) } return { ...pageMemo, [nextPageAnswer.uuid]: { answers: getInspectionEditInitialAnswers(nextPageAnswer.answers), }, } }, {})
Map with Object assign
const answers = [ { "uuid": "38913ba2-98fa-48b3-bb2a-ac9d550a1e1a", "answers": [ { "questionUuid": "097707bb-c20d-41a5-8dad-22e2b54dcfd4", "value": "2022-06-04T12:00:00+01:00" }, { "questionUuid": "c6866d6f-dadf-457c-9ef5-4973b2c5d3b3", "value": "fdgsfdg" }, { "questionUuid": "95ddb5b6-1bdc-4e62-820c-6d8a135f5603", "value": "dfsfgsdg" } ] }, { "uuid": "a25f4908-bca2-40c7-8d4c-fefe81ce663c", "answers": [ { "questionUuid": "16a47c7f-707a-4b38-9538-3b38dab07314", "value": "dsadasdsdaa" } ] } ] const getInspectionEditInitialAnswers = (answers) => { return answers.map((answer)=>({[answer.questionUuid]: answer.value})) } const initialValuesMap = answers.map((pageAnswer) => { if (pageAnswer.sections?.length) { return pageAnswer.sections.map( (sectionAnswers) => ({ [sectionAnswers.uuid]: { answers: getInspectionEditInitialAnswers(sectionAnswers.answers), }, }), {}, ) } return { [pageAnswer.uuid]: { answers: getInspectionEditInitialAnswers(pageAnswer.answers), }, } }, {}) const initialValues = Object.assign({}, ...initialValuesMap)
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Result
Reduce
Map with Object assign
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of JavaScript code is crucial to identify optimization opportunities and improve application performance. The provided benchmark definition represents two test cases: `Reduce` and `Map with Object.assign`. Both tests aim to measure the performance of transforming an array of objects into a nested object structure. **Benchmark Definition** The benchmark definition specifies the following parameters: * A JavaScript function that takes an array of objects as input. * The function is expected to transform the array into a nested object structure, where each object's `uuid` serves as a key in the resulting object. * Two different approaches are compared: * `Reduce`: Using the `reduce()` method to iterate over the array and create the nested object structure. * `Map with Object.assign`: Using the `map()` method followed by `Object.assign()` to achieve the same result. **Options Compared** The two options being compared have different performance characteristics: * **Reduce**: This approach uses a single iteration over the array, which can be more efficient for large datasets. However, it requires more memory allocation and copying of objects during each iteration. * **Map with Object.assign**: This approach involves two iterations: mapping the array into an intermediate object and then using `Object.assign()` to create the final nested object structure. It may require more memory allocations and copies. **Pros and Cons** Here's a summary of the pros and cons for each option: * **Reduce** * Pros: * Efficient for large datasets due to single iteration. * May be faster in some cases. * Cons: * Requires more memory allocation and copying during each iteration. * Can lead to performance issues with very large datasets or slow JVMs. * **Map with Object.assign** * Pros: * Reduces the risk of performance issues due to large dataset sizes, as it breaks the transformation into smaller steps. * Can be more efficient for small to medium-sized arrays, as it minimizes memory allocation and copying overhead. **Library/Dependencies** The benchmark uses a library or module that is not explicitly mentioned in the provided code snippet. However, based on the usage of `Object.assign()` and the structure of the nested object, it's likely that a utility library for working with objects (e.g., Lodash) or native JavaScript methods are being used. **Special JS Features/Syntax** There are no special JavaScript features or syntaxes mentioned in the benchmark code. The transformations rely solely on standard JavaScript methods like `reduce()`, `map()`, and `Object.assign()`. **Benchmark Results** The latest benchmark results show that: * Firefox 101 performs better for both test cases. * The `Reduce` approach has a higher execution frequency per second compared to the `Map with Object.assign` approach. Overall, this benchmark highlights the importance of choosing the right algorithmic approach based on the specific requirements and constraints of your application. By understanding the trade-offs between different methods, you can optimize your code for better performance and memory efficiency.
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