Benchmark: Set union - MeasureThat.net

Script Preparation code:

var set1 = new Set(`hNF3l0P4cN
QQfOLyCS4x
ZszvkTI37o
IynKxZthCK
ouwci5cS7j
r7jX5XQb1p
1dj2hYGU60
4Q6utWsqC6
XmTmsXafwn
EvvglORogV
G2sWUp3k9g
oso9pMt1NB
mSJpyz5XdL
AiZWvwpGqD
mH6YqIcvTt
5k6d0LaiGh
ZI511srBaE
nU6OeCjDP3
REi51NlQF1
G3wOYKZ4kb`.split(/\s/g));
var set2 = new Set(`IIVSIoKcV7
scRjrTjTwX
peydSQMOfd
Sp3F2lZ2Ae
rPb1Omg5yB
STpbhl8ICX
MlAd0k8ivJ
AffgUA9jhc
FjNg0f21G7
EkJqj5b6kI
nKMvAL4n6F
5KsVjUQtw1
MBpocHEPvW
M246F2AaCW
YXFNxRHBEZ
MWOvSvDomc
Mdhe89kU1N
arVnYE1hfy
BIPP10nDR2
mxAFx10DH4`.split(/\s/g));

Tests:

spread
var result = new Set([...set1, ...set2]);
Generator
var result = new Set(function*(){ yield* set1; yield* set2; }());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
Generator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spread	875539.1 Ops/sec
Generator	117693.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested on MeasureThat.net.

**Benchmark Definition**

The benchmark definition represents a JavaScript function that creates a set by concatenating two sets using the spread operator (`...`). The code:
```javascript
var result = new Set([...set1, ...set2]);
```
is compared across different approaches.

**Approaches Compared**

There are two approaches being compared:

1. **Spread Operator**: Using the spread operator (`...`) to concatenate the sets.
2. **Generator**: Using a generator function to yield each set element individually.

**Pros and Cons of Each Approach**

**Spread Operator:**

Pros:

* Fast and efficient, as it uses a optimized internal implementation.
* Easy to read and understand for developers familiar with JavaScript.

Cons:

* May not be compatible with older browsers or environments that don't support the spread operator.

**Generator:**

Pros:

* Can be useful in certain scenarios where using a generator function provides additional benefits (e.g., iteration, chaining).
* Can help optimize performance by avoiding unnecessary set creation.

Cons:

* Less intuitive and more verbose compared to the spread operator.
* May incur additional overhead due to the use of a generator function.

**Library Used**

The `Set` class is used in both approaches. A `Set` is a collection of unique values, which is essential for this benchmark.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark that would require specific knowledge to understand.

**Other Alternatives**

If the spread operator were not available, an alternative approach could be using the `concat()` method:
```javascript
var result = new Set(set1.concat(set2));
```
However, this approach is generally slower and less efficient than the spread operator. Another alternative would be using a library like Lodash's `unionBy` function:
```javascript
var _ = require('lodash');
var result = _.unionBy(set1, set2);
```
But again, this approach may incur additional overhead due to the use of a third-party library.

**Benchmark Preparation Code**

The script preparation code is used to create two sets (`set1` and `set2`) containing large numbers of strings. These sets are then used in the benchmark to test the performance of each approach.

I hope this explanation helps software engineers understand what's being tested on MeasureThat.net!

Related benchmarks:

Set union (version: 0)

Comparing performance of: spread vs Generator

Created: 5 years ago by: Guest

Jump to the latest result

spread

Generator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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