Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Last char remove V1.0
(version: 0)
Comparing performance of:
Slice vs Substring
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var x = "slice vs substring - remove last char";
Tests:
Slice
x.slice(10);
Substring
x.substring(0, x.length - 1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Slice
Substring
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
7 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15
Browser/OS:
Safari 26 on Mac OS X 10.15.7
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=623352" width="100%" height="500px"></iframe>
Slice
324.8M/s
Substring
323.7M/s
View exact numbers
Test name
Executions per second
✓
Slice
324,767,680 Ops/sec
Substring
323,665,568 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its options. **Benchmark Purpose:** The benchmark measures the performance difference between two string manipulation methods in JavaScript: `slice()` and `substring()`. Specifically, it tests how long each method takes to remove the last character from a given string. **Options Compared:** 1. **`slice()`**: The `slice()` method returns a new string that contains all characters of the original string except for the last one. It is often used when you need to extract a subset of characters from a larger string. 2. **`substring()`**: The `substring()` method returns a new string that contains all characters of the original string, starting from a specified index and ending at a specified end index (exclusive). When only an end index is provided, it effectively removes the last character. **Pros and Cons:** * **`slice()`**: * Pros: + More straightforward to use when you need to extract a subset of characters. + Can be more efficient for large strings since it returns a new string without modifying the original. * Cons: + Creates an additional object in memory, which can impact performance if used extensively. * **`substring()`**: + Pros: + Modifies the original string, making it potentially faster than `slice()`. + Can be more efficient for strings that are already being modified elsewhere. * Cons: + Can return unexpected results when used incorrectly (e.g., if the end index is less than 0). + May not be suitable for all use cases where you need to preserve the original string. **Library:** There are no libraries explicitly mentioned in the provided benchmark definition or test case. However, it's worth noting that JavaScript engines like V8 (used by Chrome) and SpiderMonkey (used by Firefox) implement these string manipulation methods. The performance differences between `slice()` and `substring()` can be influenced by how well the engine optimizes these methods. **Special JS Feature/Syntax:** There are no special features or syntax mentioned in this benchmark that require any particular knowledge of JavaScript beyond its basic functionality. **Alternatives:** * Other string manipulation methods like `indexOf()`, `lastIndexOf()`, `charAt()`, and `substr()` could be compared to see which ones offer the best performance for specific use cases. * The benchmark also doesn't account for potential differences in performance when using these methods on different types of strings (e.g., arrays, regex patterns). * For more advanced JavaScript features or syntax, consider benchmarks like the popular "JSPerf" or "BenchmarkJS" tests.
Related benchmarks
slice vs substring remove last char
Comments
Confirm delete:
Do you really want to delete benchmark?