Benchmark: flatMap vs map vs concatinating

Script Preparation code:

var fullArray = new Array(78).fill({arr: new Array(17372).fill('a')});

Tests:

flatMap
var results = fullArray.flatMap(({arr}) => arr)
concatinating
var results = []; fullArray.forEach(({arr}) => results.push(...arr))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
flatMap
concatinating

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing three different approaches to process an array of strings:

1. `flatMap`
2. `map` with concatenation
3. `concatinating`

**Test Case 1: `flatMap`**

In this test case, the `flatMap` method is used to flatten a nested array. The code creates an array of objects, where each object has a property `arr` that's also an array. The `flatMap` method returns a new array with all the elements from the inner arrays.

**Test Case 2: `map` with concatenation**

In this test case, the `forEach` method is used to iterate over the inner arrays and concatenate their elements into a single array using the spread operator (`...`). This approach is similar to using `concat`, but it's more concise and efficient in modern JavaScript.

**Options Compared**

The two approaches compared are:

* `flatMap`: creates a new array with all the elements from the inner arrays
* `map` with concatenation: creates a single array by concatenating the elements of each inner array

**Pros and Cons**

* **flatMap**:
	+ Pros:
		- More concise and expressive syntax
		- Can be more efficient because it avoids creating intermediate arrays
	+ Cons:
		- May not work well with older browsers or environments that don't support `flat()`
		- Can be slower than other approaches due to its recursive nature
* **map` with concatenation**:
	+ Pros:
		- Works in older browsers and environments that don't support `flatMap`
		- Can be faster because it avoids creating intermediate arrays
	+ Cons:
		- More verbose syntax
		- May not be as efficient due to the need for concatenation

**Library/Utility**

There is no external library used in this benchmark. However, some JavaScript engines and browsers may use their own optimizations or implementations of `flatMap` that are not compatible with modern JavaScript.

**Special JS Features/Syntax**

The test case uses the `let const` syntax, which is a feature introduced in ECMAScript 2015 (ES6). It's used to declare variables with block scope, which can help improve code readability and maintainability. The use of template literals (`var fullArray = new Array(78).fill({arr: new Array(17372).fill('a')})`) is also a feature introduced in ES6.

**Other Alternatives**

If you wanted to test alternative approaches, some options could be:

* Using `reduce` instead of `flatMap`
* Using `slice()` or `subarray()` instead of `map`
* Using `concat()` or `Array.prototype.push.apply()` instead of concatenation
* Using a library like Lodash or Underscore.js for more functional programming approaches

Note that the choice of alternative approaches would depend on the specific requirements and goals of the benchmark.

Related benchmarks:

flatMap vs map vs concatinating (version: 0)

Comparing performance of: flatMap vs concatinating

Created: 2 years ago by: Guest

Jump to the latest result

flatMap

concatinating

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):