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substring vs substr vs slice
(version: 0)
Comparing performance of:
substring vs substr vs slice
Created:
6 years ago
by:
Registered User
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Tests:
substring
"0123456789".substring(9);
substr
"0123456789".substr(9);
slice
"0123456789".slice(-1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
substring
substr
slice
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's break down the benchmark. **What is being tested?** The benchmark is comparing three different JavaScript methods for extracting a substring from a string: 1. `substring()` 2. `substr()` 3. `slice()` These methods are used to extract a part of a string, but they have slightly different behavior and performance characteristics. **Description of options:** ### 1. `substring()` method The `substring()` method is used to extract a part of a string between two specified indices. The syntax is: `str.substring(startIndex, endIndex)` In the test case, it's used as: `"0123456789".substring(9);` This method returns a new string that includes all characters from `startIndex` to `endIndex-1`. **Pros:** Easy to use and understand. **Cons:** Can be slower than other methods for large strings or frequent calls. ### 2. `substr()` method The `substr()` method is similar to `substring()`, but it returns a substring starting at the specified index, until the end of the string. The syntax is: `str.substr(startIndex)` In the test case, it's used as: `"0123456789".substr(9);` This method returns a new string that includes all characters from `startIndex` to the end of the original string. **Pros:** Can be faster than `substring()` for large strings or frequent calls. **Cons:** Less intuitive and less widely supported (although it's still supported in modern browsers). ### 3. `slice()` method The `slice()` method is used to extract a part of an array or a string, starting at the specified index. The syntax is: `str.slice(startIndex)` In the test case, it's used as: `"0123456789".slice(-1);` This method returns a new array or string that includes all characters from `startIndex` to the end of the original string. **Pros:** Can be faster than `substring()` and `substr()` for large strings or frequent calls. **Cons:** Less intuitive and less widely supported (although it's still supported in modern browsers). **Library and special JS feature:** None in this test case. The methods being tested are native JavaScript methods. **Other alternatives:** 1. **Using a library like Lodash**: If you need to perform complex string manipulations, consider using a library like Lodash, which provides a wide range of utility functions, including ones for string manipulation. 2. **Using regular expressions (regex)**: Regex can be used to extract substrings from strings, but it's generally slower and more complex than the methods being tested here. **Considerations:** When choosing between these methods, consider the following: 1. **Performance**: If you're performing frequent or large-scale string manipulations, `slice()` might be a good choice. 2. **Code readability**: If you prioritize code readability and simplicity, `substring()` is likely the best choice. 3. **Browser compatibility**: If you need to support older browsers, consider using `substr()`, as it's still supported in modern browsers. That's a summary of the benchmark!
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