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ES6 Map vs Hash Table vs Keys
(version: 0)
Benchmark.js
Comparing performance of:
Array vs Hash Table vs ES6 Map
Created:
5 years ago
by:
Registered User
Go to the latest result
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>
Run tests (3)
Previous results
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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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=581715" width="100%" height="500px"></iframe>
Hash Table
63.7M/s
Array
38.4M/s
ES6 Map
8.0M/s
View exact numbers
Test name
Executions per second
✓
Hash Table
63,652,484 Ops/sec
Array
38,354,324 Ops/sec
ES6 Map
7,965,822 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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
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