Benchmark: eval vs reflect - MeasureThat.net

Script Preparation code:

function compare(a,b){ return a >= b; }

Tests:

eval
eval("20 >= 30");
reflect
Reflect.apply(compare, undefined, [20, 30]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
eval
reflect

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Windows

View result in a separate tab

Test name	Executions per second
eval	8751323.0 Ops/sec
reflect	7137254.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is testing two approaches for comparing values:

1. `eval("20 >= 30");`
2. `Reflect.apply(compare, undefined, [20, 30]);`

Both tests are measuring the execution speed of these two methods in a JavaScript environment.

**Options Compared**

The two options being compared are:

* `eval`: A built-in JavaScript function that evaluates a string as JavaScript code.
* `Reflect.apply`: A method from the Reflect API that applies a given function to a set of arguments, similar to `apply` but with additional features like support for Proxy and Symbol.

**Pros and Cons**

### Eval

Pros:

* Simple and widely supported
* Easy to write and understand

Cons:

* Can lead to security vulnerabilities if not used carefully (e.g., eval("x = 5; x") can evaluate arbitrary code)
* May have performance issues due to the overhead of parsing and executing the string as JavaScript code

### Reflect.apply

Pros:

* More efficient than `eval` since it avoids the overhead of parsing and executing the string as JavaScript code
* Provides additional features like support for Proxy and Symbol, making it a more modern and robust choice

Cons:

* May require more expertise to use correctly, especially when dealing with complex scenarios
* Not all browsers or environments support Reflect API

**Library/Functionality**

The `compare` function is not explicitly mentioned in the benchmark definition. However, it's implied that this function is defined elsewhere and used by both tests. The purpose of this function is likely to compare two values.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in the benchmark definition.

**Other Alternatives**

If you wanted to test similar scenarios using alternative approaches, here are a few options:

* Using `Function` constructor instead of `eval`
* Using `function()` with arrow functions instead of `compare` function
* Testing other comparison methods like `===`, `!=`, `>`, `<`, etc.

**Additional Considerations**

When running benchmarks, it's essential to consider factors like:

* Test duration: How long does the test take to run?
* Test variability: Are there any variations in results due to differences in environment or hardware?
* Test coverage: Does the benchmark cover all possible scenarios, or are there edge cases missing?

Measuring these factors can provide a more comprehensive understanding of the performance characteristics of each approach.

Related benchmarks:

eval vs reflect (version: 0)

Comparing performance of: eval vs reflect

Created: 4 years ago by: Guest

Jump to the latest result

eval

reflect

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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