Benchmark: ES6 Map vs Hash Table vs Keys

Tests:

Array
const myObj = {a:1,b:2,c:3} const myArr = Object.keys(myObj) myArr.includes("c")
Hash Table
const myObj = {a:1,b:2,c:3} myObj.hasOwnProperty("c")
ES6 Map
const myObj = {a:1,b:2,c:3} const myMap = new Map(Object.entries(myObj)) myMap.has("c")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array
Hash Table
ES6 Map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36 Edg/132.0.0.0

Browser/OS: Chrome 132 on Windows

View result in a separate tab

Test name	Executions per second
Array	38354324.0 Ops/sec
Hash Table	63652484.0 Ops/sec
ES6 Map	7965822.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Overview**

The provided JSON represents a benchmark test that compares the performance of three data structures: arrays, hash tables (objects), and ES6 Maps. The test is designed to measure the execution time of various methods on these data structures.

**Data Structures Compared**

1. **Arrays**: An array is a fundamental data structure in JavaScript that stores a collection of values. In this benchmark, we're measuring the performance of the `includes()` method, which checks if a specific value exists within the array.
2. **Hash Tables (Objects)**: A hash table is an object that stores key-value pairs. We're measuring the performance of the `hasOwnProperty()` method, which checks if a property exists in the object.
3. **ES6 Maps**: An ES6 Map is a new data structure introduced in ECMAScript 2015 that provides a way to store key-value pairs. We're measuring the performance of the `has()` method, which checks if a specific value exists within the map.

**Options Compared**

In each test case, we have two options: using the `includes()` method (for arrays) or `hasOwnProperty()` (for hash tables). Both methods are used to check for the existence of a specific value within the data structure. The ES6 Map test uses the `has()` method.

**Pros and Cons of Each Approach**

1. **Arrays - includes()**
	* Pros:
		+ Wide support across browsers
		+ Easy to use
	* Cons:
		+ May not be as efficient for large datasets
2. **Hash Tables (Objects) - hasOwnProperty()**
	* Pros:
		+ Efficient for large datasets
		+ Can be faster than `includes()` for arrays
	* Cons:
		+ May not work as expected for non-object values
3. **ES6 Maps - has()**
	* Pros:
		+ Efficient and fast
		+ Designed specifically for key-value pairs
	* Cons:
		+ Less support across browsers (although improving)

**Library Usage**

In the benchmark, we don't have any explicit library usage. However, it's worth noting that some of these methods might rely on underlying libraries or engine optimizations.

**Special JS Features/Syntax**

None of the provided benchmark definitions use special JavaScript features or syntax. The code is straightforward and easy to understand.

**Other Alternatives**

If you're looking for alternative data structures or performance comparisons, here are a few examples:

* For arrays, you might want to compare the performance of `indexOf()`, `findIndex()`, or `forEach()` methods.
* For hash tables (objects), you could compare the performance of `in` operator or `for...in` loop.
* For ES6 Maps, you might want to explore other methods like `keys()`, `values()`, or `entry()`.

Some popular alternatives for data structures and performance comparisons include:

* Microbenchmarking libraries like Benchmark.js or fast-benchmark
* Performance profiling tools like Chrome DevTools or Firefox Developer Edition
* Online benchmarking platforms like jsperf or testbench

Related benchmarks:

ES6 Map vs Hash Table vs Keys (version: 0)

Comparing performance of: Array vs Hash Table vs ES6 Map

Created: 4 years ago by: Registered User

Jump to the latest result

Array

Hash Table

ES6 Map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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