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slice vs substr vs substring (with end index) 847
(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:
4 years ago
by:
Guest
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Script Preparation code:
var example = 'there is no spoon o8i3yuer4 ghpf398oghyfp3[0o8iwqer4hfg['
Tests:
slice
var result = example.slice(10, 15)
substr
var result = example.substr(10, 5)
substring
var result = example.substring(10, 15)
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 break down what's being tested in this benchmark. **Benchmark Goal:** The goal of this benchmark is to compare the performance of three JavaScript methods for substring extraction: `slice()`, `substr()`, and `substring()`. **Methods Compared:** 1. **`slice()`**: Returns a new string that includes all characters from the original string, starting at the specified start index (exclusive) and ending at the specified end index (exclusive). 2. **`substr()`**: Returns a new string that includes all characters from the original string, starting at the specified start index (inclusive) and ending at the specified end index (inclusive). 3. **`substring()`**: Returns a new string that includes all characters from the original string, starting at the specified start index (exclusive) and ending at the specified end index (inclusive). **Pros and Cons of Each Approach:** * **`slice()`**: Pros: + More efficient than `substr()` and `substring()`, as it avoids creating an intermediate string. + Can be used to extract a substring without specifying an end index, making it more flexible. * **`substr()`**: Pros: + Simple and straightforward implementation. + Can be used when the start index is inclusive. * **`substring()`**: Pros: + More intuitive naming convention than `substr()`. + Can be used when the start index is exclusive. Cons: * **`slice()`**: + Requires specifying both start and end indices, which can be less readable if only one index is known. + Not as widely supported or optimized as other methods. * **`substr()`**: Can lead to performance issues if not implemented correctly (e.g., when dealing with large strings). * **`substring()`**: May perform worse than `slice()` and `substr()` in some cases due to its unnecessary creation of an intermediate string. **Library Used:** None. The benchmark uses built-in JavaScript methods for substring extraction. **Special JS Feature or Syntax:** None mentioned in the provided information, but it's worth noting that the use of `slice()`, `substr()`, and `substring()` may have been influenced by the ECMAScript specification, which defines these methods for string manipulation. **Alternatives:** Other alternatives to these three methods include: * **`indexOf()`** and **`lastIndexOf()`**: Can be used to find the index of a substring within another string. * **Regular Expressions (RegExp)**: Can be used to match patterns in strings, including substrings. * **Third-party libraries or custom implementations**: May offer more efficient or feature-rich alternatives for substring extraction. Keep in mind that these alternatives may come with their own trade-offs and requirements, such as increased complexity or performance overhead.
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