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slice vs substr vs substrin
(version: 0)
Compares slice, substr and substring to each other when there is only a start index
Comparing performance of:
slice vs substr
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var example = 'there is no spoon'
Tests:
slice
let result = example.slice(2, 4); result = example.slice(2, 4); result = example.slice(2, 4); result = example.slice(2, 4); result = example.slice(2, 4);
substr
let result = example.substr(2, 4); result = example.substr(2, 4); result = example.substr(2, 4); result = example.substr(2, 4); result = example.substr(2, 4);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
substr
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 the benchmark and explain what's being tested. **Benchmark Overview** The benchmark is designed to compare the performance of three JavaScript methods: `slice()`, `substr()`, and `substring()`. Specifically, it tests how these methods perform when called with only a start index, but no end index (i.e., `slice(2)`, `substr(2)`, and `substring(2)`). **Methods Being Compared** 1. **`slice()`**: Returns a new string containing from the specified start index up to, but not including, the specified end index. 2. **`substr()`**: Returns a new string containing from the specified start index to the specified length (i.e., `example.substr(2, 4)` would return `eim`). 3. **`substring()`**: Similar to `substr()`, but can also include the end index by specifying `length` as -1 (`example.substring(2, 6)` would return `eim`). **Pros and Cons of Each Approach** * **`slice()`**: + Pros: Generally faster than `substr()` and `substring()`, especially for small strings. + Cons: May not work correctly if the end index is greater than or equal to the string length, resulting in an empty string being returned. * **`substr()`**: + Pros: Can handle cases where the end index is greater than or equal to the string length by returning a substring of the entire remaining string. + Cons: May be slower than `slice()`. * **`substring()`**: + Pros: Provides more flexibility in handling edge cases, including an optional second argument for specifying the end index. + Cons: May have performance overhead compared to `substr()`. **Library and Special JS Features** None of these methods rely on any external libraries or special JavaScript features. They are built-in string manipulation functions that have been part of the JavaScript language since its inception. **Other Alternatives** If you need to manipulate strings in JavaScript, other alternatives include: * Using regular expressions (`RegExp`) to extract substrings. * Utilizing third-party libraries like `lodash` (which provides a `slice()` function) or `string-polyfill` (which provides implementations of string methods like `slice()`, `substr()`, and `substring()`). * Leveraging modern JavaScript features like template literals or the `split()` method to achieve similar results. In summary, this benchmark helps users compare the performance of three fundamental string manipulation functions in JavaScript: `slice()`, `substr()`, and `substring()`. The results can inform developers about which approach is most suitable for their specific use case.
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