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Plus equals is slow 222
(version: 0)
Why the hell 222
Comparing performance of:
Plus equals vs Plus vs Var plus equals vs var plus
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; }
var plus
var x = 0; for (var i=0; i < 1000; i++) { x = x + 2 + i; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Result
Plus equals
Plus
Var plus equals
var plus
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring the performance of different JavaScript expressions is a complex task, and I'll break it down into manageable parts. **Benchmark Overview** The provided benchmark measures the performance of four different JavaScript expressions that perform addition operations on a variable `x`. The expressions are: 1. `Plus equals`: `x += 2 + i` 2. `Plus`: `x = x + 2 + i` 3. `Var plus equals`: `var x = 0; x += 2 + i` 4. `Var plus`: `var x = 0; x = x + 2 + i` **Options Compared** The benchmark compares the performance of these four expressions on a loop that iterates from 0 to 999. **Pros and Cons of Each Approach** 1. **Plus equals (`x += 2 + i`)**: * Pros: Simple, straightforward syntax; no need to declare `x` before use. * Cons: May incur additional overhead due to the assignment operation inside the loop. 2. **Plus (`x = x + 2 + i`)**: * Pros: Clear and concise syntax; allows for better optimization opportunities. * Cons: Requires explicit declaration of `x`, which may introduce overhead. 3. **Var plus equals (`var x = 0; x += 2 + i`)**: * Pros: Similar to Plus equals, with the added benefit of scoping; avoids global scope issues. * Cons: Requires declaring `x` before use, which may incur additional overhead. 4. **Var plus (`var x = 0; x = x + 2 + i`)**: * Pros: Clear and concise syntax; allows for better optimization opportunities. * Cons: Requires explicit declaration of `x`, which may introduce overhead. **Library and Special JS Features** None of the expressions use any external libraries or special JavaScript features. The focus is on comparing the performance of basic arithmetic operations in different contexts. **Device-Specific Considerations** The benchmark results are reported for a specific device, Chrome Mobile 52 running on Android 6.0.1. It's essential to note that device-specific factors, such as processor architecture and operating system version, can significantly impact performance. **Other Alternatives** If you're interested in exploring alternative approaches or optimizations, consider the following: * Use of `const` instead of `var` for declaring variables, which can help with optimization. * Utilize `let` instead of `var` if you need to reassign the variable within a block scope. * Consider using `template literals` (`${expression}`) instead of string concatenation or interpolation for more readable and efficient code. * Explore the use of `Function` constructors or arrow functions for concise and expressive code. Keep in mind that these alternatives may not necessarily improve performance but can make your code more maintainable, readable, and efficient.
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