Benchmark: assign vs comparea

Script Preparation code:

var obj = {a: 0, b: 4, c:43};

Tests:

assign
obj.a = 100;
compare A
if (obj.a !== 0) {}
compare B
if (obj.b !== 0) {obj.b = 1}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
assign
compare A
compare B

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Browser/OS: Chrome 66 on Windows

View result in a separate tab

Test name	Executions per second
assign	11742176.0 Ops/sec
compare A	12068623.0 Ops/sec
compare B	6010072.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**

The benchmark is defined by two scripts:

1. `Script Preparation Code`: This code creates an object `obj` with properties `a`, `b`, and `c`. The object contains a specific value for each property: `0`, `4`, and `43`.
2. `Html Preparation Code`: This field is empty, indicating that no HTML preparation is required.

The benchmark definition provides the starting point for the test cases.

**Individual Test Cases**

There are three test cases:

1. **Assign**: The script sets a new value of `100` for property `a` on the object `obj`. This test case measures the execution time of assigning a value to an existing variable.
2. **Compare A**: The script checks if the value of property `a` is not equal to `0` using the `!==` operator. This test case measures the execution time of comparing two values using the `!==` operator.
3. **Compare B**: The script sets a new value of `1` for property `b` on the object `obj`, only if its current value is not equal to `0`. This test case measures the execution time of assigning a value and conditional assignment.

**Options Compared**

The benchmark compares three options:

1. **Assign**: Direct assignment of a value to an existing variable.
2. **Compare A**: Comparison using the `!==` operator.
3. **Compare B**: Conditional assignment with a check before modifying the original value.

**Pros and Cons of Each Approach**

Here's a brief analysis of each approach:

*   **Assign**:
    *   Pros: Simple, straightforward, and generally faster since it doesn't involve any operations or comparisons.
    *   Cons: May incur unnecessary computations or memory allocations if the assigned value is large or complex.
*   **Compare A**: This method involves a simple comparison and does not modify the original value. However, it may be slower due to the overhead of comparing values.
*   **Compare B**:
    *   Pros: It avoids modifying the original value while still performing some calculation.
    *   Cons: The condition check introduces additional computational overhead.

**Library Usage**

There is no explicit library mentioned in the provided benchmark definition or test cases. However, the use of the `!==` operator implies that JavaScript's equality comparison behavior is being tested.

**Special JS Features/Syntax**

The benchmark does not explicitly mention any special JavaScript features or syntax. The tests only involve basic assignment and comparison operations.

**Alternative Approaches**

If you were to rewrite these benchmarks using different approaches, here are some alternatives:

*   **Null Coalescing Operator (`??`)**: For Compare B, consider using the null coalescing operator instead of conditional checks.
*   **Arithmetic Operations**: Instead of direct assignment for Assign, use arithmetic operations (e.g., `obj.a += 100`) to compare performance with actual computations.

These alternatives can provide different insights into performance characteristics and may help identify potential bottlenecks in your code.

Related benchmarks:

assign vs comparea (version: 0)

Comparing performance of: assign vs compare A vs compare B

Created: 6 years ago by: Guest

Jump to the latest result

assign

compare A

compare B

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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