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Delete from object vs from map
(version: 0)
Deleting entries from an object vs from a Map
Comparing performance of:
Object vs Map
Created:
3 years ago
by:
Guest
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Tests:
Object
const keys = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, ]; const data = {}; keys.forEach(key => { data[key] = key; });
Map
const keys = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, ]; const mapData = new Map(); keys.forEach(key => { mapData.set(key, key); });
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Suite status:
<idle, ready to run>
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Test case name
Result
Object
Map
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of MeasureThat.net and explore what's being tested in these benchmark results. **What is being tested?** MeasureThat.net provides a platform for JavaScript microbenchmarks, allowing users to compare the performance of different approaches on various platforms. In this case, we have two individual test cases: "Object" and "Map". The test cases are designed to measure the performance of deleting entries from an object versus a Map data structure. Specifically, they create a large array `keys` with 20 elements and populate either an object `data` or a Map `mapData` with these keys. **Options compared** Two main approaches are being tested: 1. **Object**: The test creates an object `data` and populates it with the `keys` array using the `forEach` method. When deleting entries, the object is modified directly. 2. **Map**: The test creates a Map `mapData` and populates it with the same `keys` array using the `set` method. When deleting entries, the Map is updated using the `delete` method. **Pros and Cons of each approach** Here are some general pros and cons of each approach: * **Object**: + Pros: Easy to implement, widely supported. + Cons: May have slower performance due to object lookup and modification. + Note: The `forEach` method creates a new scope for each iteration, which can lead to slower performance. * **Map**: + Pros: Fast lookups and updates, optimized for modern JavaScript engines. + Cons: May require more code to implement and maintain. **Library and purpose** In this case, no specific library is used. The `Map` data structure is a built-in JavaScript feature introduced in ECMAScript 2015 (ES6). **Special JS feature or syntax** No special features or syntax are being tested in these benchmark results. However, it's worth noting that modern JavaScript engines often have additional features and optimizations for Maps, such as: * `Map.prototype.delete(key)` with a specific optimization for exact matches. * Support for weak references and garbage collection. **Other alternatives** If you're interested in exploring alternative data structures or approaches, here are some options: 1. **Array**: You can use an array instead of an object or Map to store the keys. However, this might not provide the same level of performance as a Map. 2. **Set**: A `Set` data structure is another option for storing unique values, but it's not suitable for this specific benchmark scenario. 3. **WeakMap**: If you need to store key-value pairs with weak references (e.g., when dealing with circular references), you can use a `WeakMap`. Keep in mind that these alternatives might require more code or have different performance characteristics. Overall, the MeasureThat.net benchmarks provide valuable insights into the performance differences between various JavaScript approaches. By analyzing the results, you can gain a better understanding of the trade-offs involved and make informed decisions when choosing the best data structure for your specific use case.
Related benchmarks:
Delete vs destructure for objects
Delete vs destructure for objects in loop
Map vs object for deletions
Map.delete(key) VS Map.set(key, null)
Object.fromEntries vs Map
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