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slice vs substr vs substring with end
(version: 0)
Compares slice, substr and substring to each other when there is only a start index
Comparing performance of:
slice vs substr vs substring
Created:
6 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)
substr
var result = example.substr(10)
substring
var result = example.substring(0,example.length - 1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
substr
substring
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36
Browser/OS:
Chrome 139 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=615127" width="100%" height="500px"></iframe>
substring
292.5M/s
slice
260.4M/s
substr
245.9M/s
View exact numbers
Test name
Executions per second
✓
substring
292,488,192 Ops/sec
slice
260,353,952 Ops/sec
substr
245,863,424 Ops/sec
Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark tests the performance of three different methods in JavaScript for extracting substrings from a string: `slice()`, `substr()`, and `substring()`. Let's break down each method and their options: **1. `slice()`:** This method extracts a portion of a string defined by two indices: * **Start Index (Required):** Where the substring should begin. * **End Index (Optional):** The index where the substring ends (exclusive). If omitted, it includes all characters from the start index to the end of the string. In this benchmark, `slice(0,-1)` extracts a substring starting at index 0 and ending at (but not including) the last character of the string `"there is no spoon"`. **2. `substr()`:** This method also extracts a portion of a string: * **Start Index (Required):** Where the substring should begin. * **Length (Required):** The number of characters to extract from the start index. In this benchmark, `substr(10)` extracts a substring starting at index 10 and taking `length` characters after that. This example doesn't specify the length, so it will include all characters after the 10th position in the string. **3. `substring()`:** * **Start Index (Required):** Where the substring should begin. * **End Index (Optional):** The index where the substring ends (exclusive). If omitted, it includes all characters from the start index to the end of the string. In this benchmark, `substring(0, example.length - 1)` extracts a substring starting at index 0 and ending at (but not including) the last character of the string. This is functionally similar to using `slice(0,-1)`. **Pros/Cons and Considerations:** * **`slice()`:** Often considered the most versatile due to its ability to handle both start and end indices, providing precise control over extracted portions. * **`substr()`:** Simpler for extracting a fixed length from a specific starting point. Less flexible than `slice()`. * **`substring()`:** Similar in functionality to `slice()` but can sometimes have slight performance variations. Less common due to the presence of `slice()`, which offers more flexibility. **Alternatives:** While these methods are standard in JavaScript, there are often alternative ways to achieve similar results, depending on your specific needs: * **Regular Expressions (`RegExp`):** Powerful for complex pattern matching and substring extraction, but can be less efficient for simple cases. * **String Methods (`indexOf`, `lastIndexOf`):** Can be combined to extract substrings by finding specific characters or patterns. Let me know if you have any other questions about this benchmark or JavaScript string manipulation techniques!
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