Benchmark: test123_123 - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

var obj = Array.from({ length: 10000 }).map((value, i) => i).reduce((val, v) => { val[v] = v; return val; }, {})

Tests:

lodash.each
_.each(obj, function(v, k) {})
lodash.map
_.map(obj, function(v, k) {})
for ... in
for (const i in obj) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.each
lodash.map
for ... in

Fastest: N/A

Slowest: N/A

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/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash.each	6925.7 Ops/sec
lodash.map	6665.0 Ops/sec
for ... in	8704.8 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents a benchmark test case, which compares different approaches for iterating over an object in JavaScript.

The script preparation code defines an object `obj` with 10,000 properties, where each property has the same value as its key. This object is used as the input for the benchmark tests.

**Options Compared**

Three options are compared:

1. **For...in loop**: This approach uses the `for...in` loop to iterate over the object's properties.
2. **Lodash.each**: This option uses the `each` function from the Lodash library to iterate over the object's properties.
3. **Lodash.map**: This option uses the `map` function from the Lodash library to create a new array with the same number of elements as the object.

**Pros and Cons**

Here are some pros and cons for each approach:

* **For...in loop**:
	+ Pros: Simple and straightforward, no additional library required.
	+ Cons: Can be slower due to the iteration over property names, not property values.
* **Lodash.each**: 
	+ Pros: Fast and efficient, uses Lodash's optimized implementation.
	+ Cons: Requires an additional library (Lodash) and may have a small overhead due to function call.
* **Lodash.map**:
	+ Pros: Fast and efficient, uses Lodash's optimized implementation.
	+ Cons: Creates a new array, which can be memory-intensive for large objects.

**Library Description**

The `lodash` library is a popular JavaScript utility library that provides various functions for tasks such as string manipulation, array manipulation, and more. In this benchmark, the `each` and `map` functions are used to iterate over the object's properties.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax mentioned in the provided data. However, it's worth noting that MeasureThat.net uses a custom "Raw UA String" format for presenting benchmark results, which may not be directly comparable to traditional benchmarking output formats.

**Other Alternatives**

Other alternatives for iterating over objects in JavaScript include:

* Using `Object.keys()` and `forEach()`:
```javascript
Object.keys(obj).forEach(key => {
  // do something with obj[key]
});
```
* Using `for...of` loop (introduced in ECMAScript 2015):
```javascript
for (const key of Object.keys(obj)) {
  // do something with obj[key]
}
```
Keep in mind that the performance characteristics of these alternatives may differ from those mentioned above.

Related benchmarks:

test123_123 (version: 0)

Comparing performance of: lodash.each vs lodash.map vs for ... in

Created: 2 years ago by: Guest

Jump to the latest result

lodash.each

lodash.map

for ... in

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):