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Copy vs traversal
(version: 0)
Comparing performance of:
Spread and single traverse vs No spread and double traverse
Created:
3 years ago
by:
Guest
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Script Preparation code:
globalThis.obj1 = Array.from({ length: 100000 }).reduce((p, c) => ({ ...p, [c]: c }), {}) globalThis.obj2 = Array.from({ length: 100000 }).reduce((p, c) => ({ ...p, [c]: c }), {})
Tests:
Spread and single traverse
Object.values({ ...obj1, ...obj2 }).every(e => e === undefined)
No spread and double traverse
Object.values(obj1).every(e => e === undefined) Object.values(obj2).every(e => e === undefined)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread and single traverse
No spread and double traverse
Fastest:
N/A
Slowest:
N/A
Latest run results:
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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 represents a benchmark definition for measuring the performance of two different approaches to accessing an object's values. * `Script Preparation Code`: This section sets up two objects, `obj1` and `obj2`, by creating an array of 100,000 elements using `Array.from()` and reducing it to an object with each element as a key-value pair. Both objects are identical. * `Html Preparation Code`: This section is empty, which means no HTML preparation is required for this benchmark. **Options Compared** The benchmark compares two approaches: 1. **Spread and single traverse**: This approach uses the spread operator (`...`) to create a new object with the values of `obj1` and `obj2`. The `Object.values()` method is then used to access the values of the resulting object, and the `every()` method checks if all values are equal to `undefined`. 2. **No spread and double traverse**: This approach does not use the spread operator and instead accesses each value individually using the dot notation (`obj1.value` and `obj2.value`). The `Object.values(obj1)` and `Object.values(obj2)` methods are used to access all values of `obj1` and `obj2`, respectively, and the `every()` method checks if all values are equal to `undefined`. **Pros and Cons** * **Spread and single traverse**: This approach is more concise and efficient since it only traverses the object once. However, it may not be compatible with older browsers or environments that don't support the spread operator. * **No spread and double traverse**: This approach is more explicit and potentially easier to understand for developers familiar with dot notation. However, it requires two separate iterations over the objects, which can be slower. **Library and Special JS Feature** There are no libraries mentioned in this benchmark definition. **Other Considerations** When writing benchmarks, consider the following factors: * **Browser compatibility**: Ensure that your benchmark is run on a range of browsers to account for differences in implementation. * **Input size and distribution**: Choose input sizes and distributions that accurately represent real-world scenarios. * **Warm-up and stress tests**: Include warm-up phases to ensure accurate results and stress testing to simulate heavy loads. **Alternatives** Other alternatives for benchmarking JavaScript performance include: * `jsperf` (discontinued) * ` benchmarks.js` * `js-bench` These tools provide similar functionality to MeasureThat.net, allowing developers to create and run microbenchmarks to measure performance.
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