Benchmark: PH - Object Creation

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Script Preparation code:

var routes = [];
var numRoutes = 10000;

var lines = 500;

for(var i = 1; i <= numRoutes; i++){
  var numLines = Math.round(Math.random() * lines);
  var lineIds = [];
  for(var j = 0; j <= numLines; j++) {
     lineIds.push(Math.round(Math.random() * lines))
  }
  routes.push({route_id: i, ids: lineIds}); 
}

Tests:

Stock
var lines = {}; routes.forEach(function(d) { d.ids.forEach(function(e) { lines[e] = (lines[e] || 0) + 1; }); }); console.log(lines)
Alternative
var lines = {}; for(var i = 1; i <= lines; i++) { lines[i] = 0; } routes.forEach(function(d) { d.ids.forEach(function(e) { lines[e] = lines[e] + 1; }); }); console.log(lines)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Stock
Alternative

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and individual test cases, explaining what is tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition represents a JavaScript microbenchmark that tests object creation performance. The script preparation code creates an array `routes` with 10,000 elements, where each element contains an array `ids` with a random number of elements between 1 and 500. The goal is to create an object `lines` that maps the `ids` from the `routes` array to their frequency count.

The HTML preparation code includes a reference to jQuery version 3.3.1, which might be used for DOM manipulation or other purposes in the benchmark.

**Individual Test Cases**

There are two test cases:

1. **Stock**: This test case uses the following JavaScript code:
```javascript
var lines = {};
routes.forEach(function(d) {
  d.ids.forEach(function(e) {
    lines[e] = (lines[e] || 0) + 1;
  });
});
console.log(lines);
```
This code uses the `forEach` method to iterate over the `ids` array and update the `lines` object. The `(lines[e] || 0)` expression is a shorthand for checking if the key `e` exists in the `lines` object, returning 0 if it doesn't.

2. **Alternative**: This test case uses the following JavaScript code:
```javascript
var lines = {};
for(var i = 1; i <= lines; i++) {
  lines[i] = 0;
}
routes.forEach(function(d) {
  d.ids.forEach(function(e) {
    lines[e] = lines[e] + 1;
  });
});
console.log(lines);
```
This code uses a traditional `for` loop to initialize the `lines` object with zeros, and then uses the same `forEach` method as in the "Stock" test case.

**Options Compared**

The two test cases differ in their approach to creating the `lines` object:

* **"Stock"`: Uses `forEach`, which is a modern JavaScript method that iterates over an array or iterable object.
* **"Alternative"`: Uses a traditional `for` loop, which can be slower and more verbose.

**Pros and Cons**

* **"Stock"`:
	+ Pros:
		- Faster execution (due to the use of `forEach`)
		- More concise code
	+ Cons:
		- May not be as easy to understand for developers unfamiliar with modern JavaScript methods
* **"Alternative"`:
	+ Pros:
		- Can be easier to understand for developers familiar with traditional `for` loops
	+ Cons:
		- Slower execution (due to the use of a traditional loop)
		- More verbose code

**Other Considerations**

* The benchmark definition uses jQuery, which might not be relevant to the performance testing itself. However, it could impact the overall execution environment.
* The `lines` object is created with an initial size of 0, which means that the first time a key is accessed, the value will be set to 1. This can affect performance depending on the specific use case.

**Alternatives**

Other alternatives for creating the `lines` object could include:

* Using a `Map` instead of an object: `var lines = new Map();`
* Using a library like Lodash or Ramda for functional programming approaches
* Using a different data structure, such as a binary search tree or a hash table

Keep in mind that these alternatives might not be relevant to the specific benchmark definition and test cases provided.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36

Browser/OS: Chrome 78 on Windows

View result in a separate tab

Test name	Executions per second
Stock	16.2 Ops/sec
Alternative	14.5 Ops/sec

Related benchmarks:

PH - Object Creation (version: 0)

Comparing performance of: Stock vs Alternative

Created: 5 years ago by: Guest

Jump to the latest result

Stock

Alternative

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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