Benchmark: Find Index vs Map

Tests:

Map
const items = [{ name: 'demo09', date: '123454532', gender: 'all' }, { name: 'demo09', date: '123454532', gender: 'all' }, { name: 'demo2', date: '123454532', gender: 'all' }, { name: 'demo3', date: '123454532', gender: 'all' }, { name: 'demo', date: '123454532', gender: 'all' }]; const currentStage = 'demo'; const stageIndex = items.map((e) => e.name).indexOf(currentStage);
Find Index
const items = [{ name: 'demo09', date: '123454532', gender: 'all' }, { name: 'demo09', date: '123454532', gender: 'all' }, { name: 'demo2', date: '123454532', gender: 'all' }, { name: 'demo3', date: '123454532', gender: 'all' }, { name: 'demo', date: '123454532', gender: 'all' }]; const currentStage = 'demo'; const stageIndex = items.findIndex((item) => item.name === currentStage);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Find Index

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 its results.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches: using `map()` and using `findIndex()`. The input data consists of an array of objects with a "name" property, which is used to find the index of a specific value in the array.

**Approach 1: Using `map()`**

In this approach, the developer uses the `map()` function to create a new array with the same elements as the original input data. Then, they use the `indexOf()` method on the resulting array to find the index of the desired value.

Here's an excerpt from the benchmark code:
```javascript
const items = [{ /* ... */ }];
const currentStage = 'demo';
const stageIndex = items.map((e) => e.name).indexOf(currentStage);
```
**Approach 2: Using `findIndex()`**

In this approach, the developer uses the `findIndex()` function to find the index of the desired value in the original array. This method is more efficient than `indexOf()` because it stops iterating as soon as it finds a match.

Here's an excerpt from the benchmark code:
```javascript
const items = [{ /* ... */ }];
const currentStage = 'demo';
const stageIndex = items.findIndex((item) => item.name === currentStage);
```
**Comparison**

The main difference between these two approaches is that `map()` creates a new array with transformed elements, while `findIndex()` returns the index of the desired value in the original array.

Pros and Cons:

* **Using `map()`**:
	+ Pros: Can be useful when you need to perform additional transformations on each element before finding its index.
	+ Cons: Creates a new array, which can be memory-intensive for large datasets. Also, it returns an array with the same length as the original array, but may not be suitable if you're looking for a single value.
* **Using `findIndex()`**:
	+ Pros: More efficient because it stops iterating once it finds a match. Returns the index of the desired value in the original array.
	+ Cons: May not work correctly if there are no matches in the array.

**Library and Special JS Features**

There is no specific library mentioned in this benchmark, but `map()` and `findIndex()` are built-in JavaScript methods that don't require any external libraries to be used.

However, it's worth noting that `findIndex()` was introduced in ECMAScript 2012 (ES6), so if you're targeting older browsers or environments, you may need to use a polyfill or alternative implementation.

**Other Alternatives**

If you need to find the index of a value in an array but don't want to use `map()` or `findIndex()`, some alternative approaches include:

1. Using `forEach()` with an iterator and checking for matches.
2. Using a `for` loop with an array index variable and iterating through the elements until finding the match.
3. Using a library like Lodash, which provides a `findIndex()` function.

However, these alternatives may not be as efficient or convenient as using `map()` or `findIndex()`, especially for large datasets or complex iteration patterns.

Related benchmarks:

Find Index vs Map (version: 0)

Comparing performance of: Map vs Find Index

Created: 5 years ago by: Guest

Jump to the latest result

Map

Find Index

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):