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array[] vs array.at()
(version: 0)
Comparing performance of:
array[0] vs array.at(0)
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var array = [0, 1, 2, 3]
Tests:
array[0]
const a = array[0]
array.at(0)
const b = array.at(0)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
array[0]
array.at(0)
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
8 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0
Browser/OS:
Chrome 139 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=615947" width="100%" height="500px"></iframe>
Test name
Executions per second
array[0]
43389528.0 Ops/sec
array.at(0)
80050528.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, along with the pros and cons of each approach. **Benchmark Overview** The benchmark is designed to compare the performance of accessing elements in an array using two different syntaxes: `array[0]` and `array.at(0)`. The goal is to determine which method is faster and more efficient. **What's being tested?** * Two options are compared: + `array[0]`: a traditional, index-based access method. + `array.at(0)`: an optional chaining method introduced in JavaScript (ECMAScript 2020) that allows accessing array elements using dot notation. * The benchmark uses two individual test cases: one for each syntax. **Pros and Cons of each approach** ### `array[0]` Pros: * Widely supported across most browsers and JavaScript implementations. * Familiar syntax for many developers. * Typically faster execution since it directly accesses the element without any additional overhead. Cons: * May not be as efficient in modern browsers that have optimized array access methods (e.g., Chrome). ### `array.at(0)` Pros: * More concise and readable syntax, especially when working with large arrays or nested objects. * Can be more expressive, allowing for better error handling and code organization. Cons: * May incur additional overhead due to the optional chaining mechanism: + In older browsers that don't support this syntax, it may result in slower execution or errors. + Modern browsers might use internal optimizations, which could affect performance. + Additional parsing and validation steps during runtime can slow down access times. **Library/Feature** In this benchmark, no specific library is used. However, the `array.at(0)` method relies on the optional chaining feature introduced in ECMAScript 2020. This feature allows accessing nested properties using dot notation, which has its own set of implications and considerations. **Special JS Feature/Syntax** The benchmark uses a special JavaScript syntax, `array.at(0)`, which is a relatively recent addition to the language (introduced in ECMAScript 2020). While it's gaining popularity, its adoption rate might be lower compared to more established methods like `array[0]`. This highlights the importance of considering browser support and compatibility when writing benchmarks or using new syntaxes. **Alternatives** If you're looking for alternatives to this benchmark or want to explore other performance comparison scenarios: 1. **Array indexing vs. array slicing**: Compare the performance of accessing elements in an array using `array[0]`, `array.slice(0, 1)`, or similar methods. 2. **Object property access vs. bracket notation**: Investigate the differences between accessing object properties using dot notation (`obj.prop`) and bracket notation (`obj['prop']`). 3. **Array iteration vs. for...of loop**: Compare the performance of iterating over an array using traditional `for` loops versus modern `for...of` loops. Keep in mind that these alternative scenarios can help you better understand the nuances of JavaScript performance, browser support, and code optimization techniques.
Related benchmarks:
array[0] vs array.at(0)
array[1] vs array.at(1) 2
array[2] vs array.at(2)
array[index] vs array.at(index)
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