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push vs idx
(version: 0)
Benchmark.js
Comparing performance of:
push vs idx
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
push
const a = []; for (let i = 0; i < 8; i++) { a.push(i); } for (let i = 0; i < 8; i++) { a.pop(); }
idx
const a = []; a.length = 8; let len = 0; for (let i = 0; i < 8; i++) { a[len] = i; len++; } for (let i = 0; i < 8; i++) { len--; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
push
idx
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.5.1 Safari/605.1.15
Browser/OS:
Safari 16 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=491896" width="100%" height="500px"></iframe>
push
28.5M/s
idx
27.9M/s
View exact numbers
Test name
Executions per second
✓
push
28,479,840 Ops/sec
idx
27,887,068 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark compares two approaches for adding elements to an empty array in JavaScript: 1. `push()`: The traditional `push()` method, which adds one or more elements to the end of an array. 2. An alternative approach using indexing (`idx`), where the length of the array is set and then elements are added at that index. **Options Compared** The benchmark tests the performance of these two approaches: * `push()`: Uses the traditional `push()` method to add 8 elements to the array. * `idx`: Uses an alternative approach, where the length of the array is set, and then elements are added at that index. **Pros and Cons of Each Approach** **Push():** Pros: * Easy to read and understand * Works with any JavaScript engine Cons: * May incur additional overhead due to the need to create a new element and add it to the array **Idx:** Pros: * Can be more efficient, as it avoids the overhead of creating a new element and adding it to the array Cons: * Requires careful handling of edge cases (e.g., what happens when trying to access an index outside the bounds of the array) * May not work with all JavaScript engines or versions **Library Used** None explicitly mentioned in the benchmark definition. However, it is likely that the `push()` method uses a library or built-in functionality to add elements to the array. **Special JS Feature/Syntax** The test case does not use any special JavaScript features or syntax that requires explanation. **Other Considerations** * The benchmark only tests the performance of these two approaches on an empty array. Real-world scenarios may involve other operations, such as removing elements or accessing elements at specific indices. * The `idx` approach assumes a fixed length for the array. If the array is supposed to grow dynamically, this approach may not be suitable. **Alternatives** Other alternatives to test the performance of adding elements to an array include: * Using a more complex data structure, such as a linked list or a tree * Adding elements in batches rather than individually * Using a different indexing scheme, such as using a `for` loop with an iterator instead of an index **Benchmark Preparation Code** The provided script preparation code is empty. This means that the benchmark does not require any specific setup or initialization before running. ```javascript // No script preparation code needed ``` **Individual Test Cases** Each test case consists of a single `benchmark definition` string, which contains the JavaScript code to be executed. The test name and other metadata are also provided: ```json { "Benchmark Definition": "...", "Test Name": "push" } ``` The benchmark results include information on the browser, device platform, operating system, executions per second, and test name for each iteration of the benchmark. ```json [ { // ... "ExecutionsPerSecond": 28479840.0, "TestName": "push" }, { // ... "ExecutionsPerSecond": 27887068.0, "TestName": "idx" } ] ```
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