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.at vs length -1
(version: 0)
Comparing performance of:
array[array.length - 1] vs array.at(-1)
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var array = Array.from({length: 100}).map(Math.random);
Tests:
array[array.length - 1]
var d = array[array.length - 1];
array.at(-1)
var z = array.at(-1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
array[array.length - 1]
array.at(-1)
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36
Browser/OS:
Chrome 146 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=627427" width="100%" height="500px"></iframe>
array[array.length - 1]
206.4M/s
array.at(-1)
202.6M/s
View exact numbers
Test name
Executions per second
✓
array[array.length - 1]
206,421,920 Ops/sec
array.at(-1)
202,625,008 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the explanation into smaller sections to make it easier to understand. **Benchmark Definition** The provided JSON represents a JavaScript benchmark, specifically testing two approaches: accessing an array element using the `at()` method versus accessing it directly with square bracket notation (`[]`). **Options Compared** Two options are being compared: 1. **Array.at()**: The `at()` method allows you to access an element in an array without having to specify its index. It's a more concise and expressive way of accessing elements. 2. **Square Bracket Notation ([])**: This is the traditional way of accessing an element in an array by specifying its index. **Pros and Cons** Here are some pros and cons of each approach: * **Array.at()**: + Pros: More concise, expressive, and readable code. + Cons: May not be as widely supported across different browsers or environments (at least in older versions). * **Square Bracket Notation ([])**: + Pros: Wide support across browsers and environments, especially for older versions that don't support `at()`. + Cons: Less concise and may look less readable. **Library Usage** There is no explicit library usage mentioned in the benchmark definition. However, it's worth noting that some browsers (e.g., Safari) have historically provided better performance for array access using the `at()` method compared to direct bracket notation. **Special JavaScript Features/Syntax** The benchmark uses a special feature called **Array.from()**, which is used to create an array from an iterable object. This syntax was introduced in ECMAScript 2015 (ES6). Other considerations: * The benchmark is designed to compare the performance of two approaches, making it useful for identifying potential bottlenecks or areas where optimization might be necessary. * By using a large array and random values, the benchmark aims to create a realistic scenario that mimics real-world usage. **Alternatives** If you're looking for alternative benchmarks or test cases, here are some options: 1. **Benchmarking libraries**: Libraries like BenchmarkJS, Microbenchmark, or jsperf can help you write and compare benchmarks. 2. **Standardized benchmarks**: Organizations like the ECMAScript Committee provide standardized benchmarks for JavaScript features and performance. 3. **Browser-specific benchmarks**: Some browsers (e.g., Chrome) offer their own benchmarking tools or APIs that can be used to create custom benchmarks. Keep in mind that each of these alternatives has its own strengths, weaknesses, and use cases.
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