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Performance Test: substring vs substr vs slice with StartIndex
(version: 0)
Comparing performance of:
slice vs substring vs substr
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var string = "I am the god of hellfire, and I bring you..."
Tests:
slice
var substring = string.slice(1);
substring
var substring = string.substring(1);
substr
var substring = string.substr(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
substring
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):
Measuring performance differences between various JavaScript methods is an essential task for any web developer or engineer. Let's break down the benchmark test case provided by MeasureThat.net. **Benchmark Definition** The main question being tested here is how to get a substring from a string in JavaScript. The three methods being compared are: 1. `slice()`: Returns a new string containing from the start index (0) up to but not including the end index. 2. `substring()`: Returns a new string containing from the start index (0) up to but not including the end index. 3. `substr()`: Returns a new string containing from the start index (0) up to and including the end index. **Options Compared** Each of these methods has its own strengths and weaknesses: * **`slice()`**: Pros: concise, fast, and widely supported. Cons: can be less readable than other options. `slice()` is generally considered the most efficient way to get a substring in JavaScript. * **`substring()`**: Pros: more readable than `slice()`, easy to understand for developers familiar with this method. Cons: slightly slower than `slice()`. This method was widely used before `slice()` became the standard, but its use has decreased over time. * **`substr()`**: Pros: more concise and readable than `substring()`, can be faster in some cases. Cons: less consistent behavior across browsers and versions (e.g., some older browsers may use a different syntax). This method is generally considered less efficient than `slice()`. **Library** There is no explicit library being used in this benchmark test case. However, it's worth noting that if you're using a library like Lodash, which provides the `pick` function, it might be used to get a substring. **Special JS feature or syntax** This benchmark does not explicitly use any special JavaScript features or syntax. It simply tests three standard methods for getting a substring from a string. **Other Considerations** When choosing between these methods, consider the following factors: * Performance: If speed is critical, `slice()` is likely your best choice. * Readability: If code readability is important, `substring()` might be a better option. * Consistency: If you need to support older browsers or versions that don't use `slice()`, `substr()` or `substring()` might be necessary. **Alternatives** If you're looking for alternative methods to get a substring in JavaScript, consider: * Using regular expressions (e.g., `string.match(new RegExp('...'))`) with the `g` flag to extract substrings. * Utilizing the `String.prototype.slice()` or `String.prototype.substr()` functions directly on string literals or template literals. Keep in mind that these alternatives might have varying degrees of performance, readability, and browser support.
Related benchmarks:
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