Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
slice vs substring (with no end index)
(version: 0)
Compares slice, substr and substring to each other when there is only a start index
Comparing performance of:
slice vs substring
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var example = 'there is no spoon.'
Tests:
slice
var result = example.slice(0, -1)
substring
var result = example.substring(0, example.lastIndexOf("."))
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:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser/OS:
Firefox 140 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=612624" width="100%" height="500px"></iframe>
slice
296.7M/s
substring
97.0M/s
View exact numbers
Test name
Executions per second
✓
slice
296,679,136 Ops/sec
substring
97,040,160 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Definition** The benchmark is comparing three JavaScript methods: `slice()`, `substr()`, and `substring()` when only a start index is provided. The goal is to determine which method performs better in this scenario. **Options Compared** 1. **Slice()**: Returns a new string containing all characters from the original string, starting at the specified index, up to but not including the specified end index (exclusive). 2. **Substr()**: Returns a substring of the original string, starting at the specified index, with the specified length. 3. **Substring()**: Returns a substring of the original string, starting at the specified start index, for the specified length. **Pros and Cons** * **Slice()**: + Pros: Fast and efficient, as it only creates a new array of indices to iterate over. + Cons: Can be slower than `substr()` or `substring()` if the end index is close to the start index. * **Substr()**: + Pros: Can be faster than `slice()` or `substring()` when dealing with large strings, as it only needs to copy a substring of the original string. + Cons: Not supported in older browsers, and can lead to security issues if not used carefully (e.g., using untrusted input). * **Substring()**: + Pros: Slightly more readable than `substr()` for some users, especially when working with non-integer start or end indices. + Cons: Can be slower than `slice()` due to the overhead of parsing the substring. **Library and Syntax** There are no libraries being used in this benchmark. The focus is on native JavaScript methods only. **Special JS Features/Syntax** None, but it's worth noting that the benchmark does use a special string literal (`"there is no spoon."`), which may be optimized by some browsers or engines. **Alternative Approaches** Other approaches could involve: 1. **String.prototype.includes()**: A more modern and efficient method for finding substrings. 2. **RegEx**: Regular expressions can also be used to find substrings, but may have different performance characteristics due to the regex engine's overhead. 3. ** Native methods from a specific library (e.g., jQuery) or framework**: Depending on the context, other libraries or frameworks might provide optimized string manipulation methods. Overall, this benchmark provides a clear and concise comparison of three essential JavaScript string methods, allowing users to determine which approach performs best in common use cases.
Related benchmarks
slice vs substr vs substring (with end index) @fran
slice vs substring (with end index)
slice vs substr vs substrings
Comments
Confirm delete:
Do you really want to delete benchmark?