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Plus equals is slow
(version: 0)
Why the hell
Comparing performance of:
Plus equals vs Plus vs Var plus equals
Created:
9 years ago
by:
Guest
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Tests:
Plus equals
let x = 0; for (var i=0; i < 1000; i++) { x += 2 + i; }
Plus
let x = 0; for (var i=0; i < 1000; i++) { x = x + 2 + i; }
Var plus equals
var x = 0; for (var i=0; i < 1000; i++) { x += 2 + i; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Plus equals
Plus
Var plus equals
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. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark named "Plus equals is slow". It has three main components: 1. **Name**: The name of the benchmark, which indicates that it's testing the performance difference between adding `+` (plus operator) and assigning `=`. 2. **Description**: A brief description of the benchmark, but it doesn't provide any specific details about what the test is measuring. 3. **Script Preparation Code** and **Html Preparation Code**: These fields are empty, which means that no additional code needs to be executed before running the benchmark. **Individual Test Cases** The benchmark consists of three individual test cases: 1. **"Plus equals"`**: * The `Benchmark Definition` is a JavaScript script that uses a `for` loop and adds 2 to the variable `x` in each iteration. * The `Test Name` indicates that this test case measures the performance of using the `+` operator for addition. 2. **"Plus"`**: * The `Benchmark Definition` is similar to the previous one, but it uses assignment (`=`) instead of the `+` operator. * This test case measures the performance of assigning 2 and then adding `i` to the variable `x`. 3. **"Var plus equals"`**: * The `Benchmark Definition` uses a different syntax with `var` keyword, which declares a variable that can be reassigned. * This test case measures the performance of using the `+` operator for addition in this specific syntax. **Library and Special JavaScript Features** In none of the provided benchmark definitions are any libraries or special JavaScript features used. The tests only rely on standard JavaScript syntax and built-in functions. **Other Considerations** The benchmark is designed to measure the performance difference between three different approaches: * Using the `+` operator for addition * Assigning 2 and then adding `i` to the variable `x` * Using a `var` keyword with reassignment The test cases cover these three approaches, allowing users to compare their performance. **Alternatives** If you were to create your own JavaScript microbenchmark, you could consider using alternative approaches or variations on these tests. Some ideas: * Measure the performance of different data structures (e.g., arrays vs. objects) for addition operations. * Use a different syntax or language feature, such as `const` or arrow functions, and measure their performance impact. * Compare the performance of different optimization techniques, like loop unrolling or caching. Keep in mind that creating effective benchmarks requires careful consideration of factors like test size, data distribution, and system load.
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