Benchmark: Reassigning let vs const

Tests:

Reassign let
let value = 100; value = 100 + 100;
Const
const value = 100; const Newvalue = 100 + 100;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Reassign let
Const

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Android 13; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0

Browser/OS: Firefox Mobile 122 on Android

View result in a separate tab

Test name	Executions per second
Reassign let	776181888.0 Ops/sec
Const	761085504.0 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 its test cases to understand what's being tested.

**Benchmark Overview**

The benchmark is comparing two approaches for reassigning values in JavaScript: `let` and `const`. The purpose of this comparison is likely to determine which approach is more efficient, especially when it comes to performance and memory usage.

**Script Preparation Code**

There is no script preparation code provided in the JSON data. This means that the benchmark starts with a clean slate, where both test cases are executed from scratch each time.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **"Reassign let"`**: This test case creates a variable `let value` and assigns it an initial value of 100. Then, it reassigns the value to be 100 + 100.
2. **"Const"`**: Similar to the previous test case, this one creates a constant `const value` and assigns it an initial value of 100. However, instead of reassigning it directly, it uses a new variable name (`Newvalue`) to store the result of the expression.

**Library Usage**

None of the provided benchmark code uses any external libraries. This is likely intentional, as the goal is to isolate the performance impact of the `let` and `const` keywords.

**JavaScript Features/Syntax**

The test cases do not use any special JavaScript features or syntax beyond the standard reassignment behavior of `let` and `const`. There are no ES6+ features like arrow functions, template literals, or destructuring, which could introduce additional performance variations.

**Alternative Approaches**

To further understand the performance difference between `let` and `const`, consider the following alternative approaches:

* **Use a loop**: Instead of reassigning values directly, use a loop to increment the value. This can help isolate the performance impact of the keyword from other factors like loop overhead.
* **Use an array**: Create an array with one element and then reassign its value. This approach can simulate real-world scenarios where variables are used as array indices or object properties.

**Other Considerations**

When interpreting the benchmark results, consider the following:

* **Browser/Device variations**: The test cases were run on a specific device (Mobile Android 13) with a specific browser (Firefox Mobile 122). It's essential to understand how different browsers and devices might impact performance.
* **Execution count**: The benchmark reports executions per second, which indicates the number of times each test case was executed within a given time frame. This can help you understand the relative performance differences between `let` and `const`.

By considering these factors and alternative approaches, you can gain a deeper understanding of the performance implications of using `let` versus `const` in your JavaScript code.

Related benchmarks:

Reassigning let vs const (version: 0)

Comparing performance of: Reassign let vs Const

Created: 2 years ago by: Guest

Jump to the latest result

Reassign let

Const

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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