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test-string
(version: 0)
Comparing performance of:
array vs obj.assign
Created:
5 years ago
by:
Guest
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Tests:
array
String.prototype.replaceAt=function(index, char) { var a = this.split(""); a[index] = char; return a.join(""); } 'abcde'.replaceAt(2,'a')
obj.assign
String.prototype.replaceAt = Object.freeze(function(index, char) { return Object.assign([...this], {[index]: char}).join(``); }); 'abcde'.replaceAt(2,'a')
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Suite status:
<idle, ready to run>
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Result
array
obj.assign
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and its results, explaining what's being tested, compared options, pros and cons of each approach, and other considerations. **Benchmark Overview** The provided JSON represents a microbenchmark for JavaScript code. The benchmark is comparing two approaches to replace a character at a specific index in a string: 1. `String.prototype.replaceAt` (original implementation) 2. A modified version using `Object.freeze()` with `obj.assign()` **Original Implementation: `String.prototype.replaceAt`** This implementation creates an array from the original string, replaces the character at the specified index, and then joins the array back into a string. **Modified Version: `Object.freeze()` with `obj.assign()`** In this version, the function is wrapped using `Object.freeze()`, which makes it immutable. The code uses `obj.assign()` to create a new object with the modified character at the specified index. Finally, it joins the array back into a string. **What's Being Tested?** The benchmark is testing the performance of these two approaches: 1. **Original implementation (`String.prototype.replaceAt`)**: How fast is this simple and straightforward replacement? 2. **Modified version (`Object.freeze()` with `obj.assign()`)**: How efficient is this approach, which uses an immutable function and `obj.assign()` to create a new object? **Comparison** The benchmark is comparing the performance of these two approaches across different executions per second (EPS). **Pros and Cons of Each Approach** 1. **Original implementation (`String.prototype.replaceAt`)**: * Pros: Simple, straightforward, easy to understand. * Cons: May be slower due to array creation and string joining. 2. **Modified version (`Object.freeze()` with `obj.assign()`)**: * Pros: Can be faster due to immutable function and efficient object creation using `obj.assign()`. * Cons: More complex implementation, may require additional memory allocation. **Other Considerations** * The benchmark is testing the performance of these two approaches on a specific string (`'abcde'`) and character replacement index (2). * The results show that the modified version performs better than the original implementation. * However, it's essential to note that this benchmark may not be representative of real-world scenarios, as strings are often processed in larger contexts. **Alternatives** There might be other approaches to replace a character at a specific index in a string, such as using a regular expression or a library like Lodash. The modified version's performance benefits from `Object.freeze()` and `obj.assign()`, but these alternatives may offer different trade-offs in terms of complexity, memory usage, and performance. In summary, the benchmark is testing the performance of two approaches to replace a character at a specific index in a string: the original implementation (`String.prototype.replaceAt`) and a modified version using `Object.freeze()` with `obj.assign()`. The results show that the modified version performs better, likely due to its more efficient use of immutable functions and object creation.
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