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(version: 0)
Comparing performance of:
First item vs Last item vs Other item
Created:
6 years ago
by:
Registered User
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Script Preparation code:
var arr = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
Tests:
First item
var res = arr[0];
Last item
var res = arr[19];
Other item
var res = arr[5];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
First item
Last item
Other item
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the details of this benchmark. **What is being tested?** The benchmark tests how fast it is to access an element at a specific index in an array using JavaScript. The test cases are: * Accessing the first item (`arr[0]`) * Accessing the last item (`arr[19]`) * Accessing an arbitrary item (`arr[5]`) **Options being compared** The benchmark is comparing three different approaches to accessing elements at a specific index in an array: 1. **Direct access**: `var res = arr[0];` This method directly accesses the element at the specified index. 2. **Last item**: `var res = arr[19];` This method accesses the last item in the array, which is equivalent to accessing the element at index 19. **Pros and Cons** The pros of direct access are: * It's a simple and straightforward approach * It has the potential for good performance However, there are some potential cons: * If the array is not large enough (e.g., fewer than 20 elements), this method may be slower than other approaches. **What library or feature is used?** No external libraries or JavaScript features are being tested in this benchmark. The test cases only use basic JavaScript syntax and built-in array methods. **Other alternatives** There are no specific alternative approaches mentioned in the benchmark, but here are a few potential ones: 1. **Looping through the array**: This approach involves looping through the entire array to find the desired element at a specific index. 2. **Using `Array.prototype.indexOf()` or `Array.prototype.lastIndexOf()``: These methods return the index of the first/last occurrence of an element in the array. Keep in mind that these alternatives may have different performance characteristics and may not be relevant to this specific benchmark. **Summary** In summary, this benchmark tests the performance of direct access to elements at a specific index in an array using JavaScript. The results show that accessing the last item (`arr[19]`) is slightly slower than accessing the first or other items.
Related benchmarks:
Array clone
arr test
First item
Array: get last item
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