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charAt vs object lookup 2
(version: 0)
Comparing performance of:
charAt vs lookup
Created:
5 years ago
by:
Guest
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Script Preparation code:
obj = { 'F1': 'actionF1', 'F2': 'actionF1', 'F3': 'actionF1', 'Escape': 'actionEscape', 'Enter': 'actionEnter', } str = 'Escape' key = 'x'
Tests:
charAt
key.charAt(0) === 'F' || key === 'Escape' ? obj[key] : null
lookup
obj[key]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
charAt
lookup
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 definition and test cases to understand what is being tested. **Benchmark Definition** The benchmark measures the performance difference between two approaches: 1. Using `charAt` (the "charAt" approach) 2. Using object lookup (`obj[key]`) (the "lookup" approach) In this specific case, both approaches are used with a key `key` that has an associated value in the `obj` object. **Description of Options Compared** The two options compared are: 1. **Using `charAt`**: This method returns the character at the specified index (`0`) from the string `str`. 2. **Object Lookup (`obj[key]`)**: This approach directly accesses a property of the `obj` object using the key `key`. **Pros and Cons of Each Approach** * **Using `charAt`**: + Pros: - Simple and concise code. - Fast, as it only involves a single string operation. + Cons: - May not be as readable or maintainable for complex use cases. - Can lead to unnecessary overhead if the string is large or the index is out of bounds. * **Object Lookup (`obj[key]`)**: + Pros: - More readable and maintainable, especially in complex scenarios. - Can be more efficient when dealing with objects that have a high number of properties. + Cons: - May involve additional overhead due to the object lookup process. **Library and Its Purpose** The `obj` variable is an object literal (JavaScript syntax). In this context, it's used as a simple data structure to store key-value pairs. The purpose of using an object here is to simulate a scenario where you need to look up values based on keys. **Special JS Feature or Syntax** There are no special JavaScript features or syntaxes mentioned in the benchmark definition. The code uses standard JavaScript syntax and built-in functions like `charAt` and object lookup. **Other Alternatives** If you were to write this benchmark from scratch, you might also consider using: * **String.prototype.includes()**: Instead of using `charAt`, you could use `includes()` to check if the key is present in the string. * **Regular expressions**: You could use regular expressions to achieve a similar result as the object lookup approach. **Benchmark Preparation Code** The preparation code sets up an object `obj` with key-value pairs and creates a string `str`. It then defines the variables `key` and `string` used in the benchmark test cases. Keep in mind that the actual performance differences between these approaches may vary depending on the specific use case, platform, and JavaScript engine being used.
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