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WeakMap vs arrays read performance !!
(version: 0)
Comparing performance of:
arrays vs weakmap
Created:
3 years ago
by:
Guest
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Tests:
arrays
let keys = []; let values = []; let weakmap = new WeakMap(); for (let i = 0; i < 100000; i++) { const keyobj = { key: i }; const valobj = { val: `val_${i}` }; keys[i] = keyobj; values[i] = valobj; weakmap.set(keyobj, valobj); } for (let i = 0; i < 100000; i++) { const key = keys[i]; const val = values[key.key]; }
weakmap
let keys = []; let values = []; let weakmap = new WeakMap(); for (let i = 0; i < 100000; i++) { const keyobj = { key: i }; const valobj = { val: `val_${i}` }; keys[i] = keyobj; values[i] = valobj; weakmap.set(keyobj, valobj); } for (let i = 0; i < 100000; i++) { const key = keys[i]; const val = weakmap.get(key); }
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Suite status:
<idle, ready to run>
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Test case name
Result
arrays
weakmap
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Description** The benchmark compares the performance of two approaches: using an array to store key-value pairs and accessing them, versus using a WeakMap data structure to store key-value pairs and accessing them. **Options Compared** 1. **Arrays**: In this approach, arrays are used to store key-value pairs, where each key is an object with a `key` property and the corresponding value is stored in another object with a `val` property. 2. **WeakMap**: In this approach, a WeakMap data structure is used to store key-value pairs. A WeakMap is a type of Map that stores keys and values, but allows the garbage collector to free up memory if the key is no longer referenced elsewhere in the code. **Pros and Cons** * **Arrays**: + Pros: Arrays are widely supported and can be easily extended with additional methods. + Cons: When accessing an array element using its index, JavaScript needs to perform a linear search for the matching object, which can lead to slower performance compared to WeakMap. * **WeakMap**: + Pros: WeakMaps provide fast access times and are optimized for this use case. + Cons: WeakMaps require V8 (the JavaScript engine used by Chrome) version 63.0 or later to support the `get` method with a single key. **Library** None of the test cases rely on any external libraries, as they only use built-in JavaScript features and data structures. **Special JS Feature or Syntax** The benchmark takes advantage of the following feature: * **WeakMap**: Introduced in ECMAScript 2015 (ES6), WeakMaps provide a way to store key-value pairs where the key can be any object, including ones that may not survive beyond the current function call. * **V8 JavaScript Engine optimizations**: To make use of WeakMap's performance benefits, the benchmark requires V8 version 63.0 or later. **Other Alternatives** 1. **Object.prototype.keys() and Object.values() methods**: These methods can be used to iterate over array-like objects and retrieve their keys and values. 2. **Array.prototype.forEach() method**: This method can be used to iterate over arrays and perform an action for each element. 3. **Map data structure**: Introduced in ECMAScript 2015 (ES6), Map is a built-in data structure that provides fast key-value pair lookups. In summary, the benchmark compares the performance of two approaches: using an array to store key-value pairs and accessing them versus using a WeakMap data structure to store key-value pairs and accessing them. The results are expected to show which approach is faster in terms of execution per second.
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