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string[0] vs slice(0,1)
(version: 0)
Compares direct index with index.length -1 vs slice
Comparing performance of:
slice vs index length
Created:
2 years ago
by:
Guest
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Script Preparation code:
var example = 'there is no spoon'
Tests:
slice
var result = example.slice(0, 1)
index length
var result = example[0]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
index length
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=511353" width="100%" height="500px"></iframe>
Test name
Executions per second
slice
16397470.0 Ops/sec
index length
16600545.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON benchmark. **Main Benchmark Definition** The main benchmark compares two ways of accessing the first character of a string: using direct indexing (`example[0]`) and using the `slice` method with a length of 1 (`example.slice(0, 1)`). **Options Compared** There are only two options being compared: 1. **Direct Indexing**: Using square brackets `[]` to access the first character of the string. 2. **Slice Method**: Using the `slice` method from the String prototype to extract a substring. **Pros and Cons of Each Approach** * **Direct Indexing (example[0])**: + Pros: Fast, lightweight, and efficient for accessing individual characters. + Cons: May not be suitable for larger strings or when working with non-ASCII characters, as it can lead to Unicode issues. * **Slice Method (example.slice(0, 1))**: + Pros: More flexible and safe than direct indexing, especially for non-ASCII characters. It also allows for more control over the substring extraction process. + Cons: Generally slower and more memory-intensive than direct indexing. **Library Used** In this benchmark, the `slice` method is used from the String prototype. The `slice` method is a built-in method in JavaScript that extracts a part of a string. It returns a new string containing the specified characters. **Special JS Feature/Syntax** There doesn't appear to be any special JavaScript features or syntax being tested in this benchmark. **Other Alternatives** In addition to direct indexing and the `slice` method, other alternatives for accessing individual characters in JavaScript might include: * Using the `charAt` method (e.g., `example.charAt(0)`): This is another built-in method that extracts a single character from a string. * Using a library like Lodash or Ramda: These libraries often provide more flexible and expressive ways to manipulate strings, including substring extraction methods. It's worth noting that for most use cases, direct indexing (`example[0]`) will be the fastest and most efficient way to access individual characters. However, when working with non-ASCII characters or requiring more control over substring extraction, the `slice` method might be a better choice.
Related benchmarks:
slice vs substring
slice vs substring (with no end index)
slice vs substring (with end index)
string[index.length -1] vs slice(-1)
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