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Return true vs empty body
(version: 0)
Comparing performance of:
emptyFunc vs trueFunc vs undefinedFunc
Created:
9 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var emptyFunc = function() {}; var trueFunc = function() { return true; } var undefinedFunc = function() { return undefined; }
Tests:
emptyFunc
emptyFunc();
trueFunc
trueFunc();
undefinedFunc
undefinedFunc();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
emptyFunc
trueFunc
undefinedFunc
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 break down the provided benchmark definition and test cases. **Benchmark Definition** The benchmark definition is a JSON object that describes two different approaches to returning `true` in JavaScript functions: one with an empty body (`emptyFunc`) and another with a simple return statement (`trueFunc`). There is also a third function (`undefinedFunc`) that returns `undefined`. The purpose of this benchmark is likely to compare the execution performance of these three approaches. **Script Preparation Code** The script preparation code provides the initial setup for each test case. It defines three functions: * `emptyFunc`: an empty function with no body. * `trueFunc`: a function that simply returns `true`. * `undefinedFunc`: a function that returns `undefined`. These functions will be used as the test cases to measure their execution performance. **Html Preparation Code** There is no HTML preparation code provided, which means that this benchmark likely measures JavaScript engine performance in isolation, without considering DOM-related tasks or other external factors. **Test Cases** The individual test cases are defined in the "Benchmark Definition" JSON object. Each test case has a unique name and a single line of code to execute: * `emptyFunc()`: calls the empty function defined earlier. * `trueFunc()`: calls the function that returns `true`. * `undefinedFunc()`: calls the function that returns `undefined`. **Comparison** The comparison is between three different approaches to returning a value in JavaScript functions: an empty body (`emptyFunc`), a simple return statement (`trueFunc`), and a function that returns `undefined` (`undefinedFunc`). The benchmark measures which approach executes faster. **Pros and Cons** * **Return true vs empty body**: This comparison is likely important because it affects the performance of JavaScript engines when dealing with functions that simply return a value. An empty body may be considered less efficient than a function with a simple return statement. * **Empty body vs undefined return**: The choice between an empty body and returning `undefined` can also impact performance, as some browsers may optimize for one case over the other. **Library Usage** There is no explicit library usage mentioned in the benchmark definition. However, it's possible that the benchmark relies on internal JavaScript engine optimizations or assumptions about function behavior. **Special JS Features/Syntax** There are no special JS features or syntax used in this benchmark. The focus is solely on comparing different approaches to returning a value. **Alternatives** Other alternatives for measuring JavaScript engine performance might include: * Comparing the execution speed of functions that perform different operations, such as arithmetic calculations vs string manipulations. * Measuring the impact of various optimization techniques, such as function inlining or dead code elimination. * Comparing the performance of different browsers or platforms on the same benchmark suite. Some popular benchmark suites for JavaScript include: * V8 (Google's JavaScript engine benchmark) * SpiderMonkey (Mozilla's JavaScript engine benchmark) * WebKit (Apple's JavaScript engine benchmark) These benchmarks often provide a more comprehensive picture of JavaScript engine performance and can help identify areas for optimization.
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