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String to number fork
(version: 0)
Comparing performance of:
parseInt vs parseFloat vs Math.floor vs ceil vs Unary vs "1" * 1 vs Class vs div vs <<
Created:
5 years ago
by:
Guest
Jump to the latest result
Tests:
parseInt
parseInt("1")
parseFloat
parseFloat("1")
Math.floor
Math.floor("1")
ceil
Math.ceil("1")
Unary
+"1"
"1" * 1
"1" * 1
Class
Number("1")
div
"1" / 1
<<
"1" << 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (9)
Previous results
Fork
Test case name
Result
parseInt
parseFloat
Math.floor
ceil
Unary
"1" * 1
Class
div
<<
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explore what's being tested on the provided JSON. **Benchmark Definition** The benchmark definition is simply a string representing a JavaScript expression that will be executed in isolation. In this case, there are two types of expressions: 1. **Parser expressions**: These are expressions that need to be parsed by the JavaScript parser, such as `parseInt("1")`, `parseFloat("1")`, and `Math.floor("1")`. The browser must parse the expression into an abstract syntax tree (AST) before executing it. 2. **Operator expressions**: These are expressions that rely on operator overloading, such as `"1" * 1` or `"1" / 1`. In these cases, the browser must interpret the operator and execute the corresponding function. **Options Compared** The benchmark compares different approaches to executing JavaScript expressions: 1. **Parser expressions**: Each test case measures the performance of parsing a specific expression using the `parseInt`, `parseFloat`, or `Math.floor` functions. 2. **Operator expressions**: Each test case measures the performance of executing an operator expression, such as `"1" * 1` or `"1" / 1`. **Pros and Cons** * **Parser expressions**: + Pros: Can be used to measure the performance of specific parsing algorithms or optimizations in the JavaScript engine. + Cons: May not accurately reflect real-world usage patterns, where operators are often used as-is. * **Operator expressions**: + Pros: More representative of real-world usage patterns, as they simulate the use of operators in JavaScript code. + Cons: Can be more complex to interpret and execute correctly, which may lead to variations in performance. **Libraries and Special Features** None of the test cases use any external libraries. However, some expressions rely on built-in JavaScript features: * `Math.floor` and `Math.ceil` functions * Operator overloading (e.g., `"1" * 1`) **Other Considerations** * **JavaScript engine optimizations**: The benchmark may not accurately reflect optimizations applied by the JavaScript engine, such as inlining or caching. * **Browser-specific differences**: Different browsers may implement JavaScript features differently, leading to variations in performance. **Alternatives** If you're interested in exploring alternative benchmarks or testing frameworks, here are a few options: 1. **V8 Profiler**: A built-in profiler for the V8 JavaScript engine used by Google Chrome. 2. **SpiderMonkey Profiler**: A built-in profiler for the SpiderMonkey JavaScript engine used by Mozilla Firefox. 3. **Node.js Performance Tools**: Built-in performance tools for Node.js, such as the `--expose-gc` flag to enable garbage collection profiling. Keep in mind that each of these alternatives has its own strengths and weaknesses, and may not be suitable for your specific use case.
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