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Write Float64Array index vs Array push
(version: 0)
Test initializing a typed array by index vs generic array by push.
Comparing performance of:
Write Float64Array by index vs Write generic array by push
Created:
4 years ago
by:
Guest
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Tests:
Write Float64Array by index
const ta = new Float64Array(100_000) for (let i = 0; i < 100_000; i++) ta[i] = i
Write generic array by push
const ga = [] for (let i = 0; i < 100_000; i++) ga.push(i)
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Suite status:
<idle, ready to run>
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Test case name
Result
Write Float64Array by index
Write generic array by push
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Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach. **Benchmark Description:** The test aims to compare the performance of initializing a typed array by index versus using the generic Array API with `push()` method. In JavaScript, there are two primary types of arrays: typed arrays and generic arrays. Typed arrays are specialized for specific data types (e.g., `Float64Array`, `Int32Array`) and offer better performance when working with that type. **Options Compared:** The benchmark compares two approaches: 1. **Typed Array by Index**: Creating a `Float64Array` instance using the `new Float64Array(size)` constructor, where `size` is the length of the array to be created. 2. **Generic Array by Push**: Creating an empty array using `[]`, and then pushing elements onto it using the `push()` method. **Pros and Cons:** 1. **Typed Array by Index**: * Pros: + Better performance, as it avoids the overhead of the `push()` method. + More efficient memory allocation, as the array is created with a fixed size. * Cons: + Limited to specific data types (e.g., float, int), which may not be suitable for all use cases. 2. **Generic Array by Push**: * Pros: + More flexible, as it can handle any type of value. * Cons: + Slower performance due to the overhead of the `push()` method and dynamic memory allocation. **Library Used:** In the benchmark code, a library called `Float64Array` is used. This is a typed array that provides efficient storage for 64-bit floating-point numbers. **Special JS Features/Syntax:** None mentioned in this specific benchmark. **Other Alternatives:** Before using these approaches, developers may consider other alternatives: * Using `Array.from()` method to create an array from a given iterable, which can be more flexible than creating an empty array and then pushing elements. * Using the `Map` or `Set` data structures for storing key-value pairs or unique values, respectively. **Benchmark Preparation Code:** As mentioned in the benchmark definition, there is no preparation code provided. The actual performance comparison is executed during the test runs. **Individual Test Cases:** The benchmark defines two individual test cases: 1. **Write Float64Array by index**: This test case creates a `Float64Array` instance and initializes it with 100,000 elements using a loop. 2. **Write generic array by push**: This test case creates an empty array and pushes 100,000 elements onto it using a loop. These test cases measure the performance of initializing typed arrays versus using the generic Array API with `push()`.
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