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Remove last element of string: slice vs substr vs substring
(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:
7 years ago
by:
Guest
Jump 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(0, example.length - 1)
substring
var result = example.substr(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:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark and explain what's being tested. **Benchmark Definition** The benchmark is designed to compare three different methods for removing the last character from a string: `slice()`, `substr()`, and `substring()`. In this specific case, only two out of the three tests are included in the benchmark, as the third one has an identical implementation (`substr(0, example.length - 1)`). **Options Compared** The benchmark is comparing: 1. **Slice**: The `slice()` method returns a new string containing all characters from the original string, starting at the specified index and ending at the specified end index (exclusive). In this case, `example.slice(0,-1)` will return a new string without the last character. 2. **Substring** (with `substr`): The `substr()` method returns a substring of the original string, starting at the specified start index and ending at the specified end index. Since only two tests are shown, we'll assume one uses a valid implementation (`example.substr(0, example.length - 1)`) and the other has an identical implementation as Slice (i.e., `example.substr(0, example.length - 1)`). **Pros and Cons** * **Slice**: Pros: efficient, fast execution; Cons: may not be suitable for all use cases (e.g., when you want to modify the original string). * **Substring** (with `substr`): Pros: can be used to extract substrings, but it may have performance issues with large strings. Cons: implementation may vary between browsers and JavaScript engines. **Library Usage** There is no library explicitly mentioned in the benchmark definition or individual test cases. However, it's worth noting that some JavaScript engines (e.g., V8) provide more efficient implementations of `slice()` and `substring()` than others. **Special JS Features or Syntax** None are used in this benchmark. **Other Considerations** When writing benchmarks like this one, consider the following: 1. **Standardization**: The benchmark uses a fixed string (`example = 'there is no spoon'`) for consistency across all test cases. 2. **Test Case Separation**: Each test case has a clear and concise name (e.g., `slice`, `substr`), making it easy to identify the specific method being tested. 3. **Execution Frequency**: The benchmark reports execution frequency per second, which provides valuable information about performance. **Alternatives** If you're interested in exploring other JavaScript methods for string manipulation, consider: 1. **Regular Expressions (regex)**: can be used for more complex string manipulations and pattern matching. 2. **String Methods with Custom Implementations**: some JavaScript engines or libraries provide custom implementations of `slice()` and `substring()`, which might offer better performance. Overall, this benchmark provides a clear comparison of three common JavaScript methods for removing the last character from a string.
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slice vs substr vs substring (remove first and last char)
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slice vs substring (with no end index)
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