Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
slice vs substring remove last char
(version: 0)
Comparing performance of:
slice vs substring
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var str = 'HH:MM aa'
Tests:
slice
var strSlice = str.slice(0,-1)
substring
var strSubstr = str.substring(0, str.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:
6 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36 Edg/143.0.0.0
Browser/OS:
Chrome 143 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=623876" width="100%" height="500px"></iframe>
slice
22.9M/s
substring
19.7M/s
View exact numbers
Test name
Executions per second
✓
slice
22,924,958 Ops/sec
substring
19,736,804 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. **Benchmark Definition** The benchmark definition is a simple JavaScript statement that creates a variable `str` with the value `'HH:MM aa'`. This string will be used as input for the test cases. **Test Cases** There are two test cases: 1. `slice`: Creates a new string slice from `str`, starting from the beginning (`0`) and ending at the second-to-last character (`-1`). This effectively removes the last character of the original string. 2. `substring`: Creates a new substring from `str`, starting from the beginning (`0`) and ending at the length of the original string minus one (`str.length-1`). This also effectively removes the last character of the original string. **Options Compared** The two test cases are comparing the performance of using `slice` versus `substring` to remove the last character from a string. In other words, they are measuring which method is faster. **Pros and Cons** * **Slice**: Pros: + More concise and readable. + Can be used with array methods like `filter()` or `map()`. Cons: + May not be as efficient as `substring` for very large strings due to the overhead of creating a new array. * **Substring**: Pros: + More explicit and predictable. + Can be more efficient than `slice` for very large strings, since it avoids creating a new array. Cons: + Less concise and less readable. **Library/Functionality** Neither `slice()` nor `substring()` are libraries or functions that require special knowledge. They are built-in JavaScript methods that have been part of the language since its inception. However, if you're using an older version of JavaScript that doesn't support these methods (e.g., Internet Explorer 8 or earlier), you may need to use a polyfill or a different approach. **Special JS Feature/Syntax** Neither `slice()` nor `substring()` require any special JavaScript features or syntax. They are standard built-in methods that can be used in most modern JavaScript environments. **Other Alternatives** If you need to remove the last character from a string, you could also use: * String slicing with an empty substring: `str.slice(0, str.length-1)` * String concatenation and trimming: `str + str.slice(1)` However, these alternatives may not be as efficient or readable as using `slice()` or `substring()`.
Related benchmarks
Last char remove V1.0
Comments
Confirm delete:
Do you really want to delete benchmark?