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FilterMap vs Map v2
(version: 0)
Comparing performance of:
Map vs FilterMap
Created:
5 years ago
by:
Guest
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Script Preparation code:
var obj = { messages: [ { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": false, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": false, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": false, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": true, "message": "testing this message", "other_prop": null, "type": "customer_message" }, { "read": false, "message": "testing this message", "other_prop": null, "type": "customer_message" } ] }
Tests:
Map
let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.map(m => { return m.read ? m : Object.assign({}, m, { read: true });});
FilterMap
let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.filter(m => {return m.read === false}).map(m => { return m.read ? m : Object.assign({}, m, { read: true });});
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Map
FilterMap
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark definition, test cases, and latest benchmark result to explain what's being tested, compared, and their pros/cons. **Benchmark Definition** The benchmark measures the performance of two approaches: `FilterMap` and `Map v2`. The benchmark creates an object with a nested array `messages`, which contains multiple objects with different properties. **Script Preparation Code** ```javascript var obj = { messages: [... /* large array of objects */ ] }; ``` This code initializes an object `obj` with a nested array `messages`. **Html Preparation Code** Since there is no HTML preparation code, the benchmark only runs in the JavaScript environment. **Individual Test Cases** There are two test cases: 1. **Map** ```javascript let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.map(m => { return m.read ? m : Object.assign({}, m, { read: true }); }); ``` This code creates a new object `newObj` with an empty array `messages`. It then assigns the original `obj.messages` array to `newObj.messages` using `Object.assign()`. Finally, it maps over the `newObj.messages` array and returns each element if its `read` property is true; otherwise, it returns a new object with the same properties as the original element but with an additional `read: true` property. 2. **FilterMap** ```javascript let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.filter(m => {return m.read === false}).map(m => { return m.read ? m : Object.assign({}, m, { read: true }); }); ``` This code is similar to the `Map` test case but adds an additional filter using the `filter()` method. It first filters out elements with `read: false`, and then maps over the remaining elements. **Latest Benchmark Result** The latest benchmark result shows two execution times: 1. **FilterMap**: 183,091 executions per second (on Chrome Mobile 89) 2. **Map**: 182,793 executions per second (on Chrome Mobile 89) This suggests that `FilterMap` is slightly faster than `Map v2`. **What's being tested?** The benchmark measures the performance of two different approaches: `FilterMap` and `Map v2`. The test cases create objects with nested arrays and filter/multiply over them to determine which approach is faster. **Options compared** 1. **FilterMap**: uses a combination of `filter()` and `map()` 2. **Map v2**: uses `Object.assign()` followed by `map()` **Pros/Cons** * **FilterMap**: + Pros: may be faster due to fewer overheads + Cons: requires an additional filter step, which might slow it down for large datasets * **Map v2**: + Pros: allows for lazy evaluation and may perform better with larger datasets + Cons: uses more memory allocations and operations **Other considerations** The benchmark doesn't account for the size of the input data or the specific requirements of the use case. Larger datasets might affect the performance differences between `FilterMap` and `Map v2`. Additionally, other factors like optimization techniques, caching, or parallel processing might impact the results. As a software engineer, you should consider these factors when choosing an approach for your specific use case.
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