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Map.get versus Array.find for 100 elements
(version: 0)
Benchmark.js
Comparing performance of:
Array to Map and find vs Array.find
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
data = [...Array(100)].map((_, id) => ({ id, data: Math.random() })) map = new Map(data.map(v => [v.id, v]))
Tests:
Array to Map and find
const res = map.get(50)
Array.find
const res = data.find(({ id }) => id === 50)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array to Map and find
Array.find
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0
Browser/OS:
Chrome 138 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=614387" width="100%" height="500px"></iframe>
Array to Map and find
24.5M/s
Array.find
1.2M/s
View exact numbers
Test name
Executions per second
✓
Array to Map and find
24,484,348 Ops/sec
Array.find
1,218,406 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. The provided JSON represents two benchmark definitions, each testing different approaches to retrieve data from an array or a Map object. We'll break down what's being tested and explore the pros and cons of each approach. **Benchmark 1: "Map.get versus Array.find for 100 elements"** In this benchmark, we're comparing two methods: 1. `map.get()`: This method retrieves the value associated with a given key from a Map object. 2. `Array.find()` : This method returns the element in an array that satisfies the provided testing function. **Pros and Cons:** * `Map.get()`: + Pros: Generally faster than `Array.find()` since it uses a hash table-based lookup, which is optimized for fast lookups. + Cons: Requires creating a Map object beforehand, which might incur additional overhead. Also, the key must be present in the Map for this method to work. * `Array.find()` : + Pros: More flexible and easier to use, as it doesn't require creating an intermediate data structure (like a Map). It also works with arrays of arbitrary types. + Cons: Generally slower than `Map.get()`, especially for large datasets, since it iterates through the array until finding a match. **Other Considerations:** * Performance difference is likely to be significant between these two methods, depending on the size and distribution of data. For smaller datasets or those with many duplicates, `Array.find()` might become competitive with `Map.get()`. However, as the dataset grows larger, `Map.get()` will generally outperform `Array.find()`. * In terms of memory usage, both methods have similar overhead since they work with the same underlying data structure. **Library:** The library being used in this benchmark is JavaScript's built-in `Map` object and the `Array.prototype.find()` method. These are native parts of the language, making them accessible without requiring any external libraries or polyfills. **Special JS Feature/Syntax:** There isn't a specific JavaScript feature or syntax that's being tested here, as both methods rely on standard language constructs. **Other Alternatives:** For similar benchmarks, MeasureThat.net also provides other alternatives and test cases, such as: * Using `Array.prototype.findIndex()` instead of `Array.find()` * Comparing performance with different data structures, like linked lists or trees * Evaluating the impact of different data sizes on performance These additional tests help provide a more comprehensive understanding of JavaScript's performance characteristics under various scenarios.
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