Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
slice vs substr vs substring (with no end index) 1
(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
Jump to the latest result
Script Preparation code:
var example = 'there is no spoon'
Tests:
slice
var result = example.indexOf('the')
substr
var result = example.substr(0, 3)
substring
var result = example.substring(0, 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 dive into the Benchmark Definition and explain what's being tested. **Benchmark Overview** The benchmark compares three JavaScript methods for substring extraction: `slice()`, `substr()`, and `substring()` (without specifying an end index). The test focuses on finding the starting character of a specific string within another string, where there is no specified end index. This means that the test will measure how many times each method can find a substring within a given number of iterations. **Methods being compared** 1. **`slice()`**: Returns a new string object containing an element from the original string, without changing it. 2. **`substr()`**: Returns a subset of characters from the original string, starting from a specified index and going until the end of the string. 3. **`substring()`**: Similar to `substr()`, but does not default to the end of the string; instead, it requires an explicit end index. **Pros and Cons** * **`slice()`**: + Pros: Does not modify the original string, and can be more efficient when only finding a specific substring. + Cons: Requires explicit indexing, which might lead to slower performance due to the additional operation. * **`substr()`**: + Pros: Provides an easy way to extract substrings without worrying about end indices. + Cons: Defaults to the end of the string if no end index is specified, which can lead to unnecessary work. * **`substring()`**: + Pros: Provides more control over substring extraction, allowing for flexible end indices. + Cons: Requires explicit specification of both start and end indices. **Library usage** None of these methods rely on external libraries; they are built-in JavaScript functions. **Special JS features or syntax** None mentioned. All three methods use standard JavaScript constructs (indexing, strings). **Other alternatives** In modern JavaScript, you might consider using regular expressions (`RegExp`) to achieve similar results: ```javascript var regex = new RegExp('the', 'i'); var result = example.search(regex); ``` This approach provides more flexibility in matching patterns and searching for substrings. Keep in mind that while the benchmark focuses on specific substring extraction methods, it's essential to consider other factors when optimizing JavaScript performance, such as caching, memoization, or using `String.prototype.indexOf()` with `ignoreCase: true` for case-insensitive searches.
Related benchmarks:
slice vs substr vs substring with end
slice vs substr vs substring (with end index) @fran
slice vs substring (with no end index)
slice vs substring (with end index)
slice vs substr vs substrings
Comments
Confirm delete:
Do you really want to delete benchmark?