Benchmark: Lodash v native for/each

HTML Preparation code:


<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Script Preparation code:

var obj = [{a: 3120}, {b: 133303}, {c: 3022455}, {d: 6542322}, {e: 12443521}]

Tests:

lodash each
_.each(obj, function(a,b) {console.log(a)})
native forEach
obj.forEach(function(a,b) {console.log(a)})
Native for in Object.entries
for (const [a, b] in Object.entries(obj)) { console.log(`${a}: ${b}`); }
Native for of Object.entries
for (const [a, b] of Object.entries(obj)) { console.log(`${a}: ${b}`); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash each
native forEach
Native for in Object.entries
Native for of Object.entries

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:85.0) Gecko/20100101 Firefox/85.0

Browser/OS: Firefox 85 on Mac OS X 10.14

View result in a separate tab

Test name	Executions per second
lodash each	16983.9 Ops/sec
native forEach	17315.9 Ops/sec
Native for in Object.entries	15700.5 Ops/sec
Native for of Object.entries	15451.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Context**

The `MeasureThat.net` website allows users to create and run JavaScript microbenchmarks. In this case, we have a benchmark that compares the performance of `lodash` (a popular utility library) with native JavaScript implementations for `forEach` and `for...of` loops.

**Script Preparation Code**

```javascript
var obj = [{a: 3120}, {b: 133303}, {c: 3022455}, {d: 6542322}, {e: 12443521}];
```

This code defines an array `obj` containing five objects with different properties.

**Html Preparation Code**

```html
<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>
```

This line includes the `lodash` library from a CDN, which will be used in the benchmark tests.

**Test Cases**

There are four test cases:

1. **Lodash `forEach`**: `_.each(obj, function(a,b) {console.log(a)})`
2. **Native `forEach`**: `obj.forEach(function(a,b) {console.log(a)})`
3. **Native `for...in` loop**: `for (const [a, b] in Object.entries(obj)) {\r\nconsole.log(`${a}: ${b}`);\r\n}`
4. **Native `for...of` loop**: `for (const [a, b] of Object.entries(obj)) {\r\n console.log(`${a}: ${b}`);\r\n}``

Each test case uses a different approach to iterate over the `obj` array and log each property.

**Library and Syntax**

In this benchmark, `lodash` is used as a utility library for its `each` function. The `forEach` method is also native in JavaScript, so there's no need for a third-party library.

There are no special JavaScript features or syntax being tested; the focus is on comparing performance of different iteration approaches.

**Performance Comparison**

The benchmark measures the execution speed (in executions per second) of each test case using different browsers and devices. The results show that:

* Native `forEach` loop outperforms both `lodash` and native `for...of` loops.
* Native `for...of` loop is slower than native `forEach` loop but still faster than `lodash`'s `each`.
* Native `for...in` loop is the slowest of all.

**Other Alternatives**

If you were to implement a benchmark similar to this, here are some alternatives:

1. **Use a testing framework**: Instead of using JavaScript's built-in timing functions, consider using a testing framework like Jest or Mocha, which provide more robust and reliable ways to write benchmarks.
2. **Add more test cases**: Consider adding more test cases to compare other iteration approaches, such as `for...of` loops with different array iterators (e.g., `Map`, `Set`, or custom iterators).
3. **Use a more comprehensive benchmarking library**: Libraries like `benchmark.js` provide more features and options for writing high-quality benchmarks.
4. **Consider parallelization**: If you're running your benchmark on multiple CPU cores, consider using parallelization techniques to speed up the benchmarking process.

I hope this explanation helps!

Related benchmarks:

Lodash v native for/each (version: 6)

Comparing performance of: lodash each vs native forEach vs Native for in Object.entries vs Native for of Object.entries

Created: 3 years ago by: Registered User

Jump to the latest result

lodash each

native forEach

Native for in Object.entries

Native for of Object.entries

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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