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charAt vs object lookup
(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'
Tests:
charAt
's'.charAt(0) === 'F'
lookup
obj['x']
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's being tested. **Benchmark Definition** The benchmark definition provides two test cases: `charAt` and `lookup`. Both tests are designed to measure the performance of JavaScript code that accesses a specific value in an object. The first test case, `charAt`, measures the performance of the `.charAt()` method on a string literal `'s'`. The benchmark defines the string variable `str` with a specific value `'Escape'`. The second test case, `lookup`, measures the performance of using bracket notation (`obj['x']`) to access an object property. In this case, the object `obj` is defined with multiple properties that have the same value `'actionF1'`. The benchmark also defines a variable `str` with the value `'Escape'`. **Options Compared** In this benchmark, two options are being compared: 1. **Using `.charAt()` on a string literal**: This approach involves accessing a specific character in a string using the `.charAt()` method. 2. **Using bracket notation to access an object property**: This approach involves using bracket notation (`obj['x']`) to access a value in an object. **Pros and Cons of Each Approach** 1. **`.charAt()` on a string literal**: * Pros: + Fast and efficient, as it directly accesses the character at the specified index. * Cons: + Limited to accessing individual characters in strings. + May not be applicable for other use cases where access is needed beyond character indexing. 2. **Bracket notation to access an object property**: * Pros: + Flexible and widely used, allowing access to any value in an object using a dynamic key. * Cons: + Can be slower due to the overhead of string concatenation and lookup. + May not be as efficient for large objects or complex lookups. **Library Used** In the benchmark definition, the `obj` variable uses JavaScript's built-in bracket notation (`obj['x']`) to access an object property. This approach relies on the `in` operator (not shown in this snippet) to dynamically look up properties in the object. **Special JS Feature or Syntax** There is no special JavaScript feature or syntax being used in this benchmark. The code uses standard JavaScript syntax for defining objects, strings, and bracket notation. **Other Alternatives** In a real-world scenario, other alternatives might be explored: * **Using `String.prototype.indexOf()`**: Instead of `.charAt()`, you could use the `indexOf()` method to find the index of a specific character in a string. * **Using `Object.keys()` or `Object.values()`**: Depending on the desired outcome, you could use the `keys()` or `values()` methods to access an object's properties using array notation (`obj['x']`). * **Using a library like Lodash**: For more complex lookups or transformations, you might consider using a library like Lodash, which provides utility functions for working with objects and arrays. Keep in mind that these alternatives would likely change the performance characteristics of the benchmark.
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