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charAt vs charCodeAt
(version: 0)
Comparing performance of:
charAt vs charCodeAt
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
str = "F2"
Tests:
charAt
str.charAt(0) === 'F'
charCodeAt
str.charCodeAt(0) === 70
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
charAt
charCodeAt
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
11 months ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 EdgA/136.0.0.0
Browser/OS:
Chrome 136 on Android
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<iframe src="https://measurethat.net/Embed?id=607923" width="100%" height="500px"></iframe>
Test name
Executions per second
charAt
83326720.0 Ops/sec
charCodeAt
82751592.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach. **Benchmark Definition** The benchmark measures the performance difference between two JavaScript methods: `charAt` and `charCodeAt` when used to access individual characters in a string. **Script Preparation Code** ```javascript str = "F2"; ``` A simple string variable is created with the value `"F2"`. **Html Preparation Code** There is no HTML preparation code provided, so we'll assume that this benchmark is running in a headless environment or doesn't require any specific HTML setup. **Test Cases** The benchmark consists of two test cases: 1. `charAt` ```javascript str.charAt(0) === 'F' ``` This test case uses the `charAt` method to access the first character of the string and then compares it to `'F'`. 2. `charCodeAt` ```javascript str.charCodeAt(0) === 70 ``` This test case uses the `charCodeAt` method to get the Unicode code point of the first character of the string (which is `F`) and then compares it to `70`. **Library Used** There is no explicit library mentioned in the benchmark definition. However, it's likely that the benchmark is using a JavaScript engine or runtime environment that provides these methods. **Special JS Feature/Syntax** The use of `===` for equality comparison is not specific to any particular feature or syntax in JavaScript. **Other Alternatives** If we wanted to write this benchmark ourselves, here are some alternatives: 1. Using `substr` instead of `charAt`: This would involve comparing the result of `str.substr(0, 1)` to `'F'`. 2. Using a regular expression: This would involve creating a regex pattern that matches the first character of the string and then comparing it to `'F'`. **Pros/Cons** Here are some pros and cons for each approach: * **charAt**: Pros: + More readable code + Easier to understand the intent of the test case * Cons: + May have overhead due to method call and argument passing * **charCodeAt**: Pros: + Less overhead due to no method call or argument passing * Cons: + May be less readable due to using a non-standard property access * Using `substr` instead of `charAt`: Pros: + Similar performance characteristics to `charAt` * Cons: + More verbose code * Using a regular expression: Pros: + Flexibility in matching patterns * Cons: + May have additional overhead due to regex processing Overall, the choice between these approaches depends on the specific requirements of the benchmark and the trade-offs between performance, readability, and maintainability.
Related benchmarks:
char index vs charAt() vs slice()
char index vs charAt() for non-zero index
char index vs charAt() for the first character
charAt vs substr vs substring vs slice test
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