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

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year 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.

Related benchmarks:

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

Comparing performance of: Object.entries vs lodash.entries

Created: 4 years ago by: Guest

Jump to the latest result

Object.entries

lodash.entries

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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