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Substring vs Slice vs substr
(version: 0)
Comparing performance of:
Substring vs Slice vs substr
Created:
3 years ago
by:
Guest
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Tests:
Substring
const string = "--foo" string.substring(2);
Slice
const string = "--foo" string.slice(2);
substr
const string = "--foo" string.substr(2);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Substring
Slice
substr
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! The provided JSON represents a benchmark test on MeasureThat.net, which aims to compare the performance of three different string manipulation methods: `substring`, `slice`, and `substr`. These methods are part of the JavaScript Standard Library. **What is being tested?** The benchmark tests how fast these three methods can extract a substring or slice from a given string. The test strings are identical, with only the method name changing between each test case. **Options compared:** 1. **Substring**: This method returns a new string that includes the specified characters of the original string. 2. **Slice**: Similar to `substring`, but it does not create a new string and instead modifies the original string in place. 3. **Substr**: An older method ( deprecated since ECMAScript 5) that is similar to `substring` but uses a different syntax. **Pros and Cons of each approach:** 1. **Substring**: * Pros: Easy to read and write, creates a new string with the desired substring. * Cons: Creates a new object in memory, which can lead to performance issues for large strings. 2. **Slice**: * Pros: Modifies the original string in place, avoids creating a new object in memory. * Cons: Less readable and more concise syntax than `substring`, may be less intuitive for developers. 3. **Substr** (deprecated): * Pros: Older syntax is still recognized by some browsers, might be familiar to some developers. * Cons: Obsolete and not recommended for new development. **Library usage** None of the methods rely on external libraries or frameworks. **Special JS feature or syntax** There are no special features or syntax used in this benchmark. The focus is solely on comparing the performance of these three string manipulation methods. **Alternatives** If you're interested in exploring alternative ways to extract substrings or slices from strings, consider: * Using regex (regular expressions) to achieve similar results. * Leveraging modern JavaScript methods like `String.prototype.slice()` or `String.prototype.substring()`. * Implementing custom substring/slice functions using techniques like binary search or string manipulation. Keep in mind that performance differences between these methods might be negligible for most use cases, but understanding the trade-offs is essential for optimizing your code.
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