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(last character) char index vs charAt() vs slice()
(version: 0)
Compare methods for testing string's beggining character.
Comparing performance of:
character index vs charAt() vs slice()
Created:
5 years ago
by:
Guest
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Script Preparation code:
var str = 'zab rab oof'; var noop = Function.prototype;
Tests:
character index
if (str[str.length-1] == 'f') noop();
charAt()
if (str.charAt(str.length-1) == 'f') noop();
slice()
if (str.slice(-1) == 'f') noop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
character index
charAt()
slice()
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations. **Benchmark Definition** The benchmark is designed to compare three methods for accessing the first character of a string: `str[str.length-1]`, `str.charAt(str.length-1)`, and `str.slice(-1)`. **Options Compared** The three options are compared in terms of their performance, which is measured by the number of executions per second. **Pros and Cons** * **Character Index (str[str.length-1])**: + Pros: Simple and straightforward. Does not require a separate function call. + Cons: May be slower than other methods due to string slicing or indexing. * **CharAt() (str.charAt(str.length-1))**: + Pros: More readable and maintainable than character index. Provides a way to access characters in strings. + Cons: Requires a separate function call, which may introduce overhead. * **Slice(-1) (str.slice(-1))**: + Pros: Similar performance to charAt() due to browser optimization for string slicing. + Cons: May require more memory allocation compared to character index. **Library and Its Purpose** None of the options in this benchmark use a specific library. However, the `noop()` function is used as a no-op (no operation) to prevent the browser from optimizing away the test case. **Special JS Feature or Syntax** There are no special JavaScript features or syntaxes being tested in this benchmark. **Other Considerations** * The benchmark uses a relatively short string (`'zab rab oof'`) to minimize the impact of memory allocation and garbage collection. * The `noop()` function is used as a placeholder to prevent browser optimizations from affecting the test results. * The benchmark does not account for edge cases, such as empty strings or null inputs. **Alternatives** Other alternatives to compare in string manipulation benchmarks could include: * Using `substr` instead of character index or slice * Using regular expressions to access characters * Comparing performance with different data types (e.g., numbers, arrays) * Testing edge cases, such as null or undefined inputs Keep in mind that the specific options and alternatives will depend on the requirements and goals of the benchmark.
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