Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
old range vs new range
(version: 0)
Comparing performance of:
old range vs new range
Created:
9 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
function old_range(number) { return Array.apply(null, { length: number }).map(eval.call, Number) } var new_range = number => [...Array(number).keys()]
Tests:
old range
old_range(1000)
new range
new_range(1000)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
old range
new range
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **What is being tested?** The provided JSON represents a JavaScript microbenchmark test created on MeasureThat.net. The benchmark tests two approaches to generating an array of numbers: `old_range` and `new_range`. **Options compared:** * **old_range**: This function uses the `Array.apply(null, { length: number }).map(eval.call, Number)` approach to generate an array of `number` elements. * **new_range**: This function uses the `Array(number).keys()` syntax to generate an array of numbers from 0 to `number-1`. **Pros and Cons of each approach:** * **old_range**: + Pros: Can be more efficient for large arrays, as it uses a single call to `eval` which can be optimized by the browser's JavaScript engine. + Cons: Uses `eval`, which can introduce security vulnerabilities if not used carefully. Additionally, this approach creates an array of arbitrary type (i.e., `undefined` values) if the input is invalid. * **new_range**: + Pros: Safer and more predictable, as it only generates numbers from 0 to `number-1`. Also, modern browsers may optimize this syntax for large arrays. + Cons: May be slower for very large arrays due to the overhead of creating an array with a specific length. **Library usage:** Neither of these functions uses any external libraries. The `eval` function is a built-in JavaScript method that can be used to execute a string as code. **Special JS features or syntax:** The `new_range` function uses a modern JavaScript feature called "array destructuring" (introduced in ECMAScript 2015). This allows the expression `[...Array(number).keys()]` to create an array of keys from 0 to `number-1`. **Other alternatives:** If you want to avoid using `eval` or consider alternative approaches, here are a few options: * Use a custom loop or `for` statement to generate the array: `old_range = function(number) { for (var i = 0; i < number; i++) yield i; }` * Utilize modern JavaScript methods like `Array.from()`, which can create an array from a range of values: `new_range = (number) => Array.from({ length: number }, (_, i) => i);` * Leverage the browser's built-in `performance.now()` and `performance.timeOrigin` APIs to measure performance without creating arrays. Keep in mind that these alternatives may not provide the same level of efficiency or optimization as the original approaches.
Related benchmarks:
old range vs new range
Array range generating
Array.from() vs new Array() - map
Array.from() vs new Array() with index
Comments
Confirm delete:
Do you really want to delete benchmark?