Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
slice | substr | 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:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var example = 'there is no spoon'
Tests:
slice
var result = example.slice(2, 3)
substr
var result = example.substr(2, 3)
substring
var result = example.substring(2, 3)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
slice
substr
substring
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON benchmark definition and test cases. **Overview** The provided JSON defines a benchmark that compares the performance of three JavaScript methods: `slice`, `substr`, and `substring`. These methods are used to extract a subset of characters from a string. The benchmark is designed to test how these methods perform when only a start index is specified. **Benchmark Definition** In this case, the benchmark definition itself is not a script or code that needs to be executed, but rather a metadata object that provides information about the benchmark. It includes: * `Name`: A descriptive name for the benchmark. * `Description`: A brief explanation of what the benchmark tests. * `Script Preparation Code` and `Html Preparation Code`: These fields are empty in this case, indicating that no specific script or HTML code needs to be prepared before running the benchmark. **Individual Test Cases** The individual test cases define three different scenarios: 1. `slice` 2. `substr` 3. `substring` Each test case has a unique `Benchmark Definition` property, which is a script snippet that defines how to create and execute the benchmark for each method. These snippets are identical in structure and simply call one of the three methods (e.g., `example.slice(2, 3)`). **Library and Special JS Features** None of the test cases use any libraries or special JavaScript features beyond what is standard in JavaScript. **Comparison Options** The options being compared here are: 1. `slice` 2. `substr` 3. `substring` These methods differ in how they handle the index parameters: * `slice(start, end)`: Returns a substring starting at `start` and ending before or on `end`. * `substr(start, length)`: Returns a substring starting at `start` with a specified `length`. * `substring(start, end)`: Similar to `slice`, but throws an error if `end` is not provided. **Pros and Cons of Each Approach** Here's a brief summary: 1. **slice**: Simple and efficient for short strings or when only the start index is known. * Pros: Fast, simple implementation. * Cons: May incur more memory allocations due to string copying. 2. **substr**: Similar to `slice`, but with an additional parameter (`length`) that can be used to control the substring length. * Pros: Allows for more fine-grained control over the resulting substring. * Cons: May lead to unnecessary computations if `length` is large or zero. 3. **substring**: A variant of `slice` that always throws an error if `end` is not provided, making it less intuitive but potentially safer in some cases. * Pros: Forces careful consideration of method usage, reducing potential errors. * Cons: May be slower than other methods due to the additional checks. **Other Alternatives** If you need alternative ways to extract substrings from a string in JavaScript, consider using: 1. **Regex**: You can use regular expressions to extract parts of strings using patterns like `\d+` or `[a-zA-Z]+`. 2. **String.prototype.replace()`: While not strictly equivalent, this method can be used to replace characters within a string with another substring. 3. **Custom implementation**: Depending on your specific requirements, you might need to create a custom function for extracting substrings from strings. In conclusion, the provided benchmark tests the relative performance of `slice`, `substr`, and `substring` when only a start index is specified. Each method has its trade-offs in terms of efficiency, simplicity, and safety, which should be considered when choosing an approach for specific use cases.
Related benchmarks:
slice vs substring
slice vs substr vs substring with end
slice vs substring (with no end index)
slice vs substring (with end index)
Comments
Confirm delete:
Do you really want to delete benchmark?