Benchmark: Test multiple difference method v2

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</script>
Tests:
Lodash
_.differenceWith(sourceData, targetData, (target, source) => target.value === source.value)
Filter
sourceData.filter(target => !targetData.some(source => (source.value === target.value)))
Reduce with Set
var tValues = new Set(targetData.map(e => e.value)); sourceData.reduce((acc, v, k) => tValues.has(v.value) ? [] : v.value);
Reduce no set
sourceData.reduce((acc, v, k) => targetData.some(t => t.value === v.value) ? [] : v.value);
Filter with set
var tValues = new Set(targetData.map(e => e.value)); sourceData.filter(target => !tValues.has(target.value));
Rendered benchmark preparation results:
Suite status: <idle, ready to run>

Previous results
Test case name	Result
Lodash
Filter
Reduce with Set
Reduce no set
Filter with set
Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.
It seems like you're sharing benchmark results for different methods of finding the difference between two arrays in JavaScript.
To answer your question directly:
**The best method is:**
*   `_.differenceWith(sourceData, targetData, (target, source) => target.value === source.value)` - This is an implementation of the `Set` intersection problem, which provides a good trade-off between performance and readability.
*   `sourceData.filter(target => !targetData.some(source => (source.value === target.value)))` - This method uses JavaScript's native filtering capabilities and can be quite efficient for smaller arrays.
Here is some sample code to demonstrate these methods:
    ```
javascript
const sourceData = [
  { value: 'a' },
  { value: 'b' },
  { value: 'c' }
];
const targetData = [
  { value: 'd' },
  { value: 'e' }
];
console.log(_.differenceWith(sourceData, targetData, (target, source) => target.value === source.value));
// Output: [{ value: 'a' }, { value: 'b' }, { value: 'c' }]
```
    ```
javascript
const sourceData = [
  { value: 'a' },
  { value: 'b' },
  { value: 'c' }
];
const targetData = [
  { value: 'd' },
  { value: 'e' }
];
console.log(sourceData.filter(target => !targetData.some(source => (source.value === target.value))));
// Output: [{ value: 'a' }, { value: 'b' }, { value: 'c' }]
```
    ```
Latest run results:
Run details: (Test run date: 2025 years ago)
User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
Browser/OS: Chrome 63 on Windows
View result in a separate tab
Test name	Executions per second
Lodash	165.9 Ops/sec
Filter	93.8 Ops/sec
Reduce with Set	7585.5 Ops/sec
Reduce no set	94.3 Ops/sec
Filter with set	7506.2 Ops/sec
Related benchmarks:
Test multiple difference method v2 (version: 0)

Comparing performance of: Lodash vs Filter vs Reduce with Set vs Reduce no set vs Filter with set

Created: 6 years ago by: Guest

Jump to the latest result

Lodash

Filter

Reduce with Set

Reduce no set

Filter with set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):
