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Map vs Object - More items4
(version: 0)
Lookup of map vs object
Comparing performance of:
Map lookup vs Obj lookup
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var map = new Map(); var obj = {}; for (let i = 0; i < 50; i++) { map.set('a' + i, i); obj['a' + i] = i; } obj = Object.freeze(obj) var i = 0, count = 1000, a;
Tests:
Map lookup
for (i = 0; i < count; i++) { a = map.get('a' + i); }
Obj lookup
for (i = 0; i < count; i++) { a = obj['a' + i]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Map lookup
Obj lookup
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Browser/OS:
Chrome 126 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=532945" width="100%" height="500px"></iframe>
Map lookup
6K/s
Obj lookup
5K/s
View exact numbers
Test name
Executions per second
✓
Map lookup
5,633 Ops/sec
Obj lookup
4,597 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into explaining the provided benchmark. **Benchmark Definition** The benchmark measures the performance difference between two data structures: Maps and Objects in JavaScript. Specifically, it tests the lookup performance of these data structures when accessing elements using string keys. **Options Compared** Two options are compared: 1. **Map**: A Map is a data structure that stores key-value pairs. It provides fast lookups, insertions, and deletions. In this benchmark, a Map is used to store values with string keys. 2. **Object**: An Object is a data structure that stores key-value pairs, similar to a Map. However, Objects are often used for more complex scenarios, such as inheritance or prototype chains. **Pros and Cons of Each Approach** * **Map**: + Pros: Fast lookups (average O(1) time complexity), efficient insertion and deletion. + Cons: May have additional overhead due to the Map's internal implementation, which may not be as optimized for certain use cases. * **Object**: + Pros: Often easier to work with, especially when using inheritance or prototype chains. Objects can also leverage existing libraries and frameworks that optimize their lookup performance. + Cons: Lookups are generally slower than Maps (average O(1) time complexity), especially when dealing with large numbers of keys. **Library Used** Neither the Map nor Object data structure uses a library in this benchmark, as they are built-in JavaScript features. However, if you were to use an external library for your own implementation, some popular options include: * For Maps: `js- map` or `lodash.map` * For Objects: No additional library is required, but libraries like `lodash.object` can provide optimized lookup methods. **Special JS Feature or Syntax** The benchmark uses a special syntax feature in JavaScript known as **"Template Literals"**, which allows you to embed expressions inside string literals using the `\r\n` escape sequence. This syntax is used in the preparation code snippet: `"var i = 0, count = 1000, a;"`. **Other Considerations** When working with large datasets or performance-critical applications, consider factors such as: * Cache locality: How well do the data structures' internal implementations cache frequently accessed elements? * Data distribution: How evenly distributed are the keys across the data structure? * Computational overhead: Are there any additional costs associated with operations like insertion, deletion, or iteration? **Alternative Benchmarks** If you're interested in exploring alternative benchmarking scenarios: * You could test the performance of different caching mechanisms, such as `WeakMap` vs. `Object Cache`. * Compare the performance of various sorting algorithms, such as QuickSort vs. Merge Sort. * Benchmark the execution time of different JavaScript engines or interpreters. Feel free to ask if you have any further questions!
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