Benchmark: indexOf vs map 002-5f

Script Preparation code:

var array = [];
for (var i=0; i<19; ++i) {
  	array.push('000' + i);
}

var map = new Map();
array.forEach(item => map.set(item, 111));

Tests:

indexOf
for (var i=0; i<10000; ++i) { const x = array.indexOf("0009") !== -1; // middle }
map
for (var i=0; i<10000; ++i) { const x = map.get("0000") !== -1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
map

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The test compares two approaches to find an element in an array: using `Array.indexOf()` and using a `Map` data structure with `get()` method.

**Options Compared**

There are two options being compared:

1. **indexOf**: This approach uses the `Array.indexOf()` method, which iterates through the array until it finds the specified value (in this case, "0009") or returns -1 if not found.
2. **map**: This approach uses a `Map` data structure to store elements as keys and values. In this test, we create an empty map and populate it with elements from the array using the `forEach()` method. Then, we use the `get()` method to retrieve a value associated with a specific key ("0000" in this case). If the key is not found, `get()` returns -1.

**Pros and Cons**

* **indexOf**: Pros:
	+ Simple and well-known API.
	+ Fast for small arrays (e.g., 10000 elements).
Cons:
	+ Slow for large arrays, as it needs to iterate through the entire array.
	+ May be slower due to potential optimizations made by the browser.
* **map**: Pros:
	+ Faster than `indexOf` for large arrays, as it uses hash-based lookup.
	+ More efficient use of memory, as it only stores unique values.
Cons:
	+ Less intuitive API compared to `indexOf`.
	+ May be slower due to object creation and iteration.

**Library: Map**

In this benchmark, the `Map` data structure is used to store elements from the array. A `Map` is a hash-based data structure that maps keys to values. In JavaScript, `Map` was introduced in ECMAScript 2015 (ES6).

**Other Considerations**

* **Array vs Map for Large Datasets**: For very large datasets, using a `Map` can be more efficient than `indexOf`, as it reduces the number of comparisons required.
* **Cache Locality**: In some cases, the order in which elements are stored in an array can affect cache locality. Using a `Map` can help mitigate this effect.

**Alternatives**

Other alternatives for finding an element in an array include:

1. **Regular Expressions**: Using regular expressions with `String.indexOf()` or `String.search()`.
2. **Binary Search**: Implementing binary search algorithms, like QuickSelect or Introsort.
3. **Hash Tables**: Using a custom hash table implementation, like using JavaScript's built-in `Object` and its `hasOwnProperty()` method.

Keep in mind that the choice of approach depends on the specific use case, dataset size, and performance requirements.

Related benchmarks:

indexOf vs map 002-5f (version: 11)

Comparing performance of: indexOf vs map

Created: 2 years ago by: Registered User

Jump to the latest result

indexOf

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):