Benchmark: Plus equals is slow 222

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>

Previous results

Test case name	Result
Plus equals
Plus
Var plus equals
var plus

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

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.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Linux; Android 6.0.1; E6553 Build/32.2.A.0.253) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36

Browser/OS: Chrome Mobile 52 on Android 6.0.1

View result in a separate tab

Test name	Executions per second
Plus equals	170950.9 Ops/sec
Plus	375328.5 Ops/sec
Var plus equals	468591.6 Ops/sec
var plus	374921.3 Ops/sec

Related benchmarks:

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: 8 years ago by: Guest

Jump to the latest result

Plus equals

Plus

Var plus equals

var plus

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):