Benchmark: _.filter + _.map vs array push in _.forEach vs _.reduce

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/clone/2.1.2/clone.min.js"></script>

Script Preparation code:

var objs = [
      {
        "name": "test1",
        "characters": [
          {
            "_id": "5b59a34561a2220011900b7e",
            "characterID": "5ab48ce869b013001d26f49b",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b7d",
            "characterID": "5ab48ce869b013001d26f49c",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b7c",
            "characterID": "5ab48ce869b013001d26f49d",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b7b",
            "characterID": "5ab48ce869b013001d26f4a7",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b7a",
            "characterID": "5ab48ce869b013001d26f4b0",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
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            "characterID": "5ab48ce869b013001d26f4b6",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
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            "characterID": "5ab48ce869b013001d26f4bf",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
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            "characterID": "5ab48ce869b013001d26f4c4",
            "level": 1,
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            "maxSpawn": 1
          },
          {
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          {
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            "characterID": "5ab48ce969b013001d26f535",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
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          {
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            "characterID": "5ab48ce969b013001d26f53c",
            "level": 1,
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            "maxSpawn": 1
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            "maxSpawn": 1
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          {
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            "characterID": "5ab48ce969b013001d26f55b",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b5e",
            "characterID": "5ab48ce969b013001d26f568",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b5d",
            "characterID": "5ab48ce969b013001d26f569",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b5c",
            "characterID": "5ab48ce969b013001d26f56b",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
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          {
            "_id": "5b59a34561a2220011900b5b",
            "characterID": "5ab48ce969b013001d26f57e",
            "level": 1,
            "spawnRate": 24,
            "maxSpawn": 1
          },
          {
            "_id": "5b59a34561a2220011900b5a",
            "characterID": "5ab48ce969b013001d26f585",
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            "characterID": "5ab48ce969b013001d26f598",
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            "characterID": "5ab48ce969b013001d26f5a0",
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            "characterID": "5b1614bf6b9868001df21f3c",
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            "maxSpawn": 1
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        ],
        "itemCatches": [],
        "itemConsumables": [],
        "landmark": null
      }
    ]

Tests:

_.filter + _.map
var results = _(objs).filter(obj => obj.characters.level == 1).map(obj => obj.characters).value();
array push in _.forEach
var results = [] _.forEach(objs, obj => { if(obj.characters.level == 1) results.push(obj.characters) });
_.reduce
var results = _.reduce(objs, (results, obj) => { if(obj.characters.level == 1) results.push(obj.characters) return results },[]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.filter + _.map
array push in _.forEach
_.reduce

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Based on the provided data, it appears that you are trying to optimize the performance of JavaScript functions for filtering and mapping arrays. Here is a brief analysis:

**Benchmarking Results:**

The latest benchmark result shows three different test cases with varying performances:

1. `_.reduce` outperforms the other two options, executing at 5,050,720 executions per second.
2. `array push in _.forEach` is close behind, executing at approximately 4,668,690 executions per second.
3. `_.filter + _.map` has the lowest performance, executing at around 1,128,249 executions per second.

**Suggestions for Improvement:**

Based on these results, here are some suggestions:

* Consider using `_.reduce` or `Array.prototype.reduce()` if you need to accumulate results in an array.
* If your use case requires pushing elements to an array, consider using `array push in _.forEach` instead of `.filter + _.map`.
* If performance is critical and you can't use these optimized methods, consider rewriting the logic using a simple `if-else` statement or a loop.

**Code Review:**

While there isn't any specific code provided, here are some general tips for reviewing JavaScript functions:

* Use tools like Lodash or Underscore.js to simplify common operations and improve performance.
* Avoid unnecessary array copies by using `_.map()` or `Array.prototype.map()` instead of `_.reduce()`.
* Optimize loops by using `for...of` instead of `forEach()` when possible.

Please note that without the actual code, these suggestions are based on general guidelines and may not be applicable to your specific use case.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.filter + _.map	1128249.6 Ops/sec
array push in _.forEach	4668690.0 Ops/sec
_.reduce	5050720.5 Ops/sec

Related benchmarks:

_.filter + _.map vs array push in _.forEach vs _.reduce (version: 4)

_.filter + _.map vs array push in _.forEach

Comparing performance of: _.filter + _.map vs array push in _.forEach vs _.reduce

Created: 6 years ago by: Registered User

Jump to the latest result

_.filter + _.map

array push in _.forEach

_.reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):