Benchmark: unique coordinates

Script Preparation code:

var coords = [
        35.7790733, -5.8453983,
        35.779335, -5.8465283,
        35.7790733, -5.8453983,
        35.779705, -5.84782
];

var coordinates = [];

for (var i=0; i< 100; i++) {
	coordinates = coordinates.concat(coords.slice())
}

Tests:

Array from - Set
var unique = Array.from(new Set(coordinates.reduce((r, a, i) => (i % 2 ? r[r.length - 1].push(a) : r.push([a]), r), []).map(a => a.join('|'))), s => s.split('|').map(Number));
For loops
var temp = []; var unique = []; var uniqueCoords = []; for (var i = 0; i < coordinates.length; i += 2) { temp.push(coordinates[i] + '---' + coordinates[i + 1]); // create some strings } for (var i = 0; i < temp.length; i++) { if (unique.indexOf(temp[i]) === -1) // remove duplicates unique.push(temp[i]); } for (var i = 0; i < unique.length; i++) { // split the strings back into array uniqueCoords = uniqueCoords.concat(unique[i].split('---')); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array from - Set
For loops

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test case on the MeasureThat.net website. The benchmark tests two different approaches to generating unique coordinates from an array of coordinates.

**Script Preparation Code**

The script preparation code is used to generate the `coordinates` array, which is then used in both test cases. The code creates an array of 100 coordinates using the `coords` variable and concatenates it with itself 100 times to create a large dataset.

**Test Cases**

There are two test cases:

1. **"Array from - Set"**
This test case uses the `Array.from()` method to convert an array into a set, which is then used to remove duplicates. The coordinates are first mapped to strings using the `map()` method and then split into arrays using the `split()` method.
2. **"For loops"**
This test case uses two nested for loops to generate unique coordinates. The first loop creates an array of strings by concatenating pairs of coordinates, and the second loop iterates over this array and pushes each string into a new array (`unique`) only if it's not already present.

**Library Usage**

None of the provided test cases use any external libraries.

**Special JS Features/Syntax**

* `Array.from()`: This method is used to convert an array into a set, which is then used to remove duplicates. It was introduced in ECMAScript 2015 (ES6) and provides a more concise way of creating sets.
* Concatenation using the `+` operator: The test cases use string concatenation to create strings from coordinates.

**Pros and Cons of Different Approaches**

1. **"Array from - Set"**
	* Pros:
		+ More concise and efficient, as it uses built-in methods to remove duplicates.
		+ Reduces memory allocation and copying overhead compared to manual looping.
	* Cons:
		+ May be slower than manual looping for very large datasets due to the overhead of creating a set.
2. **"For loops"**
	* Pros:
		+ Can be faster for very large datasets, as it avoids the overhead of creating a set.
		+ Allows for more control over the iteration process.
	* Cons:
		+ More verbose and error-prone due to manual looping.
		+ May have higher memory allocation and copying overhead.

**Alternatives**

Other approaches that could be used in this benchmark include:

1. Using a data structure like a `Set` object or an associative array to store unique coordinates.
2. Utilizing the `Reduce()` method to merge arrays and remove duplicates.
3. Implementing a custom sorting algorithm to eliminate duplicate coordinates.

However, these alternatives may not provide the same level of efficiency as the provided test cases, especially for large datasets.

Related benchmarks:

unique coordinates (version: 0)

Comparing performance of: Array from - Set vs For loops

Created: 8 years ago by: Guest

Jump to the latest result

Array from - Set

For loops

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):