Benchmark: findIndex vs new Map

Tests:

findIndex
var test = [{name: 'test1', id: 1}, {name: 'test2', id: 2}, {name: 'test3', id: 3}]; var index = test.findIndex(i => i.name === 'test3');
map
var testMap = new Map(); testMap.set('test1', 1); testMap.set('test2', 2); testMap.set('test3', 3); if (testMap.has('test3')) { var question = testMap.get('test3'); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex
map

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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I'll break down the benchmark and explain what's being tested, compared, and its pros and cons.

**What is being tested?**

MeasureThat.net is testing two different approaches to find an element in a JavaScript array:

1. Using the `findIndex` method
2. Creating a new Map and using it to store the elements

The test cases are designed to measure the performance of each approach, specifically how many executions per second (EPS) they can handle.

**Options compared**

The two options being compared are:

* **findIndex**: This method returns the index of the first element in the array that satisfies the provided condition. If no element satisfies the condition, it returns -1.
* **new Map**: A Map is a data structure that stores key-value pairs. In this case, we're using it to store elements from an array as keys and their corresponding values (in this case, just the index of each element).

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **findIndex**:
	+ Pros: Simple to implement, easy to understand.
	+ Cons: Can be slower than using a Map if the array is large or has many duplicate elements.
* **new Map**:
	+ Pros: Can provide faster lookups and more efficient data storage for large datasets. However, it requires creating an object (the Map) that holds multiple key-value pairs.
	+ Cons: Requires more memory to store the Map object itself.

**Library and purpose**

In this benchmark, no libraries are used beyond standard JavaScript features. The `Map` object is a built-in JavaScript data structure introduced in ECMAScript 2015 (ES6).

**Special JS feature or syntax**

There's one special syntax being tested here:

* **Arrow functions**: In the `findIndex` test case, an arrow function (`i => i.name === 'test3'`) is used as the callback function. Arrow functions are a concise way to define small anonymous functions.

**Other alternatives**

If you're interested in exploring alternative approaches, here are some other options that could be considered:

* **Using `indexOf`**: Another array method that can be used to find an element.
* **Using a custom loop**: Writing a simple loop to iterate through the array and find the desired element.
* **Using a data structure like `Set`**: A Set is another data structure in JavaScript that stores unique values, which could potentially be used for fast lookups.

Keep in mind that these alternatives might not be as efficient or practical as using `findIndex` or a Map, depending on your specific use case.

Related benchmarks:

findIndex vs new Map (version: 0)

Comparing performance of: findIndex vs map

Created: 3 years ago by: Guest

Jump to the latest result

findIndex

map

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):