Benchmark: Iterating Lodash Entries vs Object.entries

HTML Preparation code:

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

Script Preparation code:

window.obj = Array.from({length: 100_000}).reduce((acc, _, i) => {
    return {...acc, [`key${i}`]: `val{i}`}
}, {})

Tests:

Object.entries
let count = 0 for (const [key, value] of Object.entries(obj)) { count++; }
lodash.entries
let count = 0 for (const [key, value] of _.entries(obj)) { count++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.entries
lodash.entries

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches: iterating over object entries using `Object.entries` (native JavaScript) versus `_.entries` from the Lodash library.

**What are being compared?**

Two test cases are compared:

1. **Native JavaScript**: Iterating over object entries using `Object.entries`.
2. **Lodash**: Iterating over object entries using `_.entries` from the Lodash library.

**Options and Considerations**

Both approaches have pros and cons:

* **Native JavaScript (Object.entries)**:
	+ Pros: Built-in function, no dependency on external libraries.
	+ Cons: May not be as efficient as optimized implementations in other languages or libraries.
* **Lodash (.entries)**:
	+ Pros: Optimized implementation, may provide better performance.
	+ Cons: Requires an additional library (Lodash), may have slower startup times.

**Libraries and their purposes**

In this benchmark, the Lodash library is used for its `_.entries` function. The purpose of this function is to iterate over the entries of an object in a convenient way.

**Special JavaScript Features or Syntax**

None mentioned in this specific benchmark, but some notable features that might be relevant include:

* **Arrow functions**: Used in some benchmark preparations and test cases (e.g., `const [key, value] of Object.entries(obj)`).
* **Spread operator**: Used in the `Script Preparation Code` to create a new object with dynamic key-value pairs (`return {...acc, [`key${i}`]: `val{i}`}\r\n`, ...}`).

**Other Alternatives**

If you need to iterate over object entries, other alternatives might include:

* Using `for...in` loop, which can be slower than `Object.entries`.
* Implementing your own iterator function using a generator or a closure.
* Using other libraries that provide optimized iteration functions (e.g., Ramda).

Keep in mind that the choice of iteration method depends on the specific use case and performance requirements.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.80 Safari/537.36

Browser/OS: Chrome 98 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.entries	36.9 Ops/sec
lodash.entries	75.0 Ops/sec

Related benchmarks:

Iterating Lodash Entries vs Object.entries (version: 0)

Comparing performance of: Object.entries vs lodash.entries

Created: 2 years ago by: Guest

Jump to the latest result

Object.entries

lodash.entries

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):