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Diffs between mapping array and keys of array
(version: 0)
Comparing performance of:
Array vs Keys
Created:
4 years ago
by:
Guest
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Tests:
Array
const arr = [ { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, ]; function mappingArr(array) { return array.map(item => ({ f: item.a, g: item.b, h: item.c, })) } mappingArr(arr);
Keys
const arr = [ { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, { a: 1, b: 2, c: 3, }, ]; function mappingArr(array) { return Object.keys(array).map(item => ({ f: array[item].a, g: array[item].b, h: array[item].c, })) } mappingArr(arr);
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Suite status:
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Test case name
Result
Array
Keys
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Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Definition** The provided JSON defines two benchmark tests: `Array` and `Keys`. Both tests aim to measure performance differences in JavaScript arrays, but they approach it from different angles. **Options Compared** In the `Array` test, the comparison is between using `map()` on an array of objects, where each object has three properties (`a`, `b`, and `c`). The resulting array will have three new properties for each original object. In the `Keys` test, the comparison is between using `Object.keys()` to get an array of keys from the original object, and then mapping over that array to create a new array with the corresponding values. **Pros and Cons** **Array Test:** Pros: * Simplistic approach, easy to understand and implement. * Focuses on the performance of the `map()` function itself. Cons: * Ignores the complexity of accessing nested properties (`array[item].a`, etc.) when using keys. * Might not accurately represent real-world scenarios where objects have many properties or complex data structures. **Keys Test:** Pros: * More representative of real-world use cases, where objects may have many properties and keys. * Highlights the performance implications of using `Object.keys()` compared to iterating over an array of indices. Cons: * Requires manual looping or iteration, which can be error-prone and harder to understand for some developers. * Might introduce additional overhead due to string lookup in `Object.keys()` **Other Considerations** Both tests use simple, linear data structures (arrays) and focus on a specific aspect of JavaScript performance. However, in real-world applications, we often encounter more complex scenarios: * Objects with many properties or nested objects * Arrays with dynamic lengths or sparse arrays * Closures, closures, and function scope issues To better represent these complexities, you might want to explore additional tests that cover: * Nested objects (e.g., `Array.prototype.map()` vs. iterating over keys) * Array manipulation techniques like `forEach()`, `filter()`, or `reduce()` * Performance characteristics of specific JavaScript engines or browsers
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