Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
arguments array vs declared arguments
(version: 0)
Comparing performance of:
arguments vs direct
Created:
7 years ago
by:
Guest
Jump to the latest result
Tests:
arguments
function foo() { return arguments[0] + arguments[1]; } var q = 0; for (var i = 0; i < 10000; i ++) { q += foo(i, i+1); } console.log(q);
direct
function foo(a, b) { return a + b; } var q = 0; for (var i = 0; i < 10000; i ++) { q += foo(i, i+1); } console.log(q);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
arguments
direct
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 what's being tested in this benchmark. **Benchmark Definition** The benchmark is comparing two approaches to calling a function with variable arguments: using the `arguments` object and declaring the arguments explicitly. **Options Compared** There are two options being compared: 1. **Arguments Object**: This approach uses the built-in `arguments` object, which is an array-like object that contains all the arguments passed to a function. 2. **Declared Arguments**: In this approach, the arguments are declared explicitly as separate variables inside the function signature. **Pros and Cons** * **Arguments Object**: + Pros: Simple to use, no need to declare additional variables. + Cons: Can be slower due to array indexing operations, may lead to unexpected behavior if not used carefully (e.g., using `arguments[0]` instead of `a`). * **Declared Arguments**: + Pros: Generally faster, more predictable behavior, and easier to debug. + Cons: Requires declaring additional variables, which can add clutter to the code. **Library/Language Features** There are no libraries or special language features being tested in this benchmark. However, it's worth noting that the use of `arguments[0]` instead of `a` is a common pattern in JavaScript, and using declared arguments is considered better practice by many developers. **Other Considerations** When deciding between these two approaches, consider the following: * Performance: If speed is critical, declaring arguments might be a better choice. * Code readability and maintainability: Declaring arguments can make code easier to understand and debug. * Code complexity: Using `arguments` objects can add complexity due to potential issues with array indexing. **Alternatives** Other alternatives for handling variable arguments in JavaScript include: * Using rest parameters (`...args`) introduced in ECMAScript 2015 (ES6+). * Using destructuring assignment (`[a, b] = [i, i + 1]`). The `rest parameters` approach is generally considered more elegant and efficient than the `arguments` object or declared arguments. However, it requires support for ES6+ syntax. I hope this explanation helps you understand what's being tested in this benchmark!
Related benchmarks:
Rest vs. Arguments to Array
Array.prototype.push vs Array.prototype.push.apply
instanceof Array vs Array.isArray
new TypedArray() vs TypedArray.of()
Array() vs new Array() fill
Comments
Confirm delete:
Do you really want to delete benchmark?