Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array split vs string substring+string.lastIndexOf
(version: 0)
Comparing performance of:
Array.split vs Substring
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var s1 = "foo.bar"; var s2 = "foo";
Tests:
Array.split
var n1 = s1.split(".")[0]; var n2 = s2.split(".")[0];
Substring
var n1 = s1.substring(0, s1.lastIndexOf(".")); var n2 = s2.substring(0, s2.lastIndexOf("."));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Array.split
Substring
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 provided JSON and explain what is being tested, compared, and the pros and cons of each approach. **Benchmark Description** The benchmark measures two different approaches for extracting a substring from a string: `Array.split` and `Substring`. **Script Preparation Code** The script preparation code provides two strings, `s1` and `s2`, which are used as input for the benchmark. `s1 = "foo.bar"` and `s2 = "foo"`. **Html Preparation Code** There is no HTML preparation code provided. **Test Cases** There are two test cases: 1. **Array.split**: This test case measures the performance of using the `split` method with an array on the string `s1`. Specifically, it extracts the first element from the split array. 2. **Substring**: This test case measures the performance of using the `substring` method with the last index of a substring from the string `s2`. **Libraries and Features** There are no libraries explicitly mentioned in the benchmark definition. However, both `Array.split` and `Substring` methods use a special feature in JavaScript: **String methods**. These methods allow you to perform operations on strings without having to manually loop through characters or use regular expressions. **Performance Comparison** The two test cases compare the performance of these two approaches: * `Array.split`: This approach involves creating an array from the split string and then extracting the first element. * `Substring`: This approach directly extracts a substring using the `substring` method, which returns the part of the original string starting from a specified index. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **Array.split**: + Pros: Efficient for extracting multiple substrings or parts of an array. + Cons: Creates an intermediate array, which can lead to additional memory allocation and garbage collection overhead. * **Substring**: + Pros: Directly extracts a substring without creating an intermediate array, potentially reducing memory overhead. + Cons: Only suitable for simple substring extraction; may be slower if dealing with complex regular expressions or large strings. **Other Alternatives** If you wanted to compare other approaches, here are a few possibilities: * **Regular Expressions**: You could use regular expressions to extract the substring, which might provide more flexibility but also comes with its own performance overhead. * **Manual Looping**: Instead of using string methods, you could write a manual loop to iterate through the characters in the string and construct the desired substring. * **Other String Methods**: Depending on your specific requirements, other string methods like `replace`, `indexOf`, or `match` might be more suitable than `split` or `substring`. Keep in mind that the choice of approach depends on the specific use case and performance characteristics you're targeting.
Related benchmarks:
Array.from(string) vs string.split("")
string split vs string substring 2
Array split vs string substring for dates
Array split vs string substring ISO String
Comments
Confirm delete:
Do you really want to delete benchmark?