Benchmark: Arrays Merge - MeasureThat.net

Tests:

Concat and Push - Map
var init=[10,11,12,13]; var params = [{val: [1,2]}, {val: [3,4]}, {val: [5,6]}, {val: [7,8]}]; init.push(...params.map(x=>x.val)); console.log(init);
Concat and Push - FlatMap
var init=[10,11,12,13]; var params = [{val: [1,2]}, {val: [3,4]}, {val: [5,6]}, {val: [7,8]}]; init.push(...(params.flatMap(x => x.val))); console.log(init);
Concat and Assign - FlatMap
var init=[10,11,12,13]; var params = [{val: [1,2]}, {val: [3,4]}, {val: [5,6]}, {val: [7,8]}]; init = init.concat(...params.flatMap(x=>x.val)); console.log(init);
Concat and Assign - Map
var init=[10,11,12,13]; var params = [{val: [1,2]}, {val: [3,4]}, {val: [5,6]}, {val: [7,8]}]; init = init.concat(...params.map(x=>x.val)); console.log(init);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Concat and Push - Map
Concat and Push - FlatMap
Concat and Assign - FlatMap
Concat and Assign - Map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Concat and Push - Map	127830.1 Ops/sec
Concat and Push - FlatMap	99116.8 Ops/sec
Concat and Assign - FlatMap	93460.1 Ops/sec
Concat and Assign - Map	114759.9 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain what's being tested on MeasureThat.net.

The benchmark measures the performance of different ways to concatenate and push or assign arrays in JavaScript.

**What is being compared:**

1. `push` with `map`: This approach uses the `map()` method to transform the inner array into an array, and then pushes all the elements from this new array onto the outer array.
2. `concat` with `map`: Similar to the previous one, but instead of using `push`, it uses the `concat()` method to concatenate the arrays.
3. `flatMap` with `push`: This approach uses the `flatMap()` method to flatten the inner arrays into a single array, and then pushes all the elements from this new array onto the outer array.
4. `concat` with `flatMap`: Similar to the previous one, but instead of using `push`, it uses the `concat()` method to concatenate the arrays.

**Options:**

1. **`map()`**: This method transforms each element in an array into a new value, returning an array of these values.
2. **`flatMap()`**: Similar to `map()`, but also flattens any nested arrays returned by the callback function.
3. **`concat()`**: This method returns a new array containing all elements from the original arrays.

**Pros and Cons:**

1. **`push()` with `map` and `flatMap`**:
	* Pros: Simple, straightforward approach that takes advantage of modern JavaScript features.
	* Cons: Can be slower than other methods due to the overhead of creating a new array and pushing elements onto it.
2. **`concat()` with `map` and `flatMap`**:
	* Pros: Can be faster than `push()` approaches since it uses a built-in method for concatenating arrays.
	* Cons: May incur additional overhead due to the creation of temporary arrays during concatenation.
3. **`flatMap()`**: This approach can be particularly useful when dealing with nested arrays, as it allows for efficient flattening and processing.

**Library usage:**

None apparent in this benchmark definition.

**Special JS feature or syntax:**

The `flatMap()` method is a relatively new addition to the JavaScript standard library, introduced in ECMAScript 2019. It's an alternative to the `map()` method that also flattens any nested arrays returned by the callback function.

**Other alternatives:**

If not using `push`, `concat`, or `flatMap`, some developers might resort to using a `for` loop or other iteration methods to concatenate and assign arrays. However, these approaches are generally less efficient than the ones being compared in this benchmark.

Overall, MeasureThat.net provides a useful tool for evaluating performance differences between various array manipulation techniques in JavaScript, helping users optimize their code for better performance.

Related benchmarks:

Arrays Merge (version: 0)

Comparing performance of: Concat and Push - Map vs Concat and Push - FlatMap vs Concat and Assign - FlatMap vs Concat and Assign - Map

Created: 3 years ago by: Registered User

Jump to the latest result

Concat and Push - Map

Concat and Push - FlatMap

Concat and Assign - FlatMap

Concat and Assign - Map

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):