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Object.fromEntries vs reduce 341235
(version: 0)
Comparing performance of:
Object.fromEntries vs Reduce (reuse object) vs Object.fromEntries with reduce
Created:
3 years ago
by:
Guest
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Script Preparation code:
var data = { ...Array.from(Array(10000).keys()) };
Tests:
Object.fromEntries
Object.fromEntries(Object.entries(data).map((key, value) => [key, null]));
Reduce (reuse object)
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = null; return acc; }, {});
Object.fromEntries with reduce
Object.fromEntries(Object.entries(data).reduce((acc, [k, v], i) => { acc.push([k, null]); return acc; }, []));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Object.fromEntries
Reduce (reuse object)
Object.fromEntries with reduce
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 JavaScript microbenchmarks. **What is tested:** The provided JSON represents a benchmark test case that compares three approaches for creating an object from an array of key-value pairs: 1. Using `Object.fromEntries()` 2. Using the `reduce()` method 3. Using `Object.fromEntries()` with the `reduce()` method These approaches are compared to measure their performance and efficiency. **Options comparison:** * **`Object.fromEntries()`**: This is a modern JavaScript method introduced in ECMAScript 2019, which creates an object from an array of key-value pairs. It's designed to be efficient and concise. * **Reduce() method**: The `reduce()` method is a built-in JavaScript function that applies a user-supplied function to each element of an array (in this case, the key-value pairs) and reduces it to a single output value. In this benchmark, it's used to create an object by pushing key-value pairs into an accumulator object. * **`Object.fromEntries()` with reduce()**: This approach is similar to the previous one but uses `reduce()` to transform the array of key-value pairs into an object before passing it to `Object.fromEntries()`. **Pros and Cons:** * **`Object.fromEntries()`**: * Pros: * Efficient and concise * Modern JavaScript standard * Cons: * Requires modern browsers or JavaScript engines that support ECMAScript 2019 * **Reduce() method**: * Pros: * Widely supported in older browsers and JavaScript engines * Can be useful for other array processing tasks beyond object creation * Cons: * Less efficient than `Object.fromEntries()` for object creation * Requires more code and manual memory management (using an accumulator object) * **`Object.fromEntries()` with reduce()**: * Pros: * Combines the benefits of both approaches: modern syntax and efficiency * Cons: * Still requires modern browsers or JavaScript engines **Library usage:** None of the provided benchmark test cases use external libraries. **Special JS features/syntax:** The `Object.fromEntries()` method uses a new, modern JavaScript feature introduced in ECMAScript 2019. This syntax allows creating an object from an array of key-value pairs in a concise and efficient way. **Other alternatives:** * Other ways to create objects from arrays include using `Array.prototype.reduce()` or loops with manual memory management. * Alternatively, you could use libraries like Lodash or Ramda for functional programming tasks, but this is not the case here as no external library is used. These alternatives would likely have different performance characteristics and code complexity compared to the benchmarked approaches.
Related benchmarks:
reduce (immutable) vs map + fromEntries
Object.fromEntries vs create temp object vs Array.reduce
Map & Object.fromEntries vs reduce
Object.fromEntries on array vs reduce on array
Object.fromEntries vs reduce round 2
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