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Reassigning let vs const
(version: 0)
Comparing performance of:
Reassign let vs Const
Created:
2 years ago
by:
Guest
Go to the latest result
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>
Run tests (2)
Previous results
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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
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<iframe src="https://measurethat.net/Embed?id=505462" width="100%" height="500px"></iframe>
Reassign let
776.2M/s
Const
761.1M/s
View exact numbers
Test name
Executions per second
✓
Reassign let
776,181,888 Ops/sec
Const
761,085,504 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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