Benchmark: number vs Number(number)

Tests:

n
for (let i = 0; i < 100000; i++) { const a = i; }
Number(n)
for (let i = 0; i < 100000; i++) { const a = Number(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
n
Number(n)

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is being tested?**

The provided benchmark tests two approaches to creating numbers in JavaScript:

1. **let** variable declaration with an initializer: `const a = i;`
2. **Number()** function wrapping around a value: `const a = Number(i);`

These approaches create numbers through different means, which can affect their performance.

**Options compared**

The two options being compared are:

* Direct assignment using the `let` keyword with an initializer
* Wrapping around a value using the `Number()` function

**Pros and Cons of each approach:**

1. **let variable declaration with an initializer:**
	* Pros:
		+ More readable code, as it explicitly declares a variable.
		+ Can be more efficient for small values, as it avoids creating a new object on the heap.
	* Cons:
		+ May incur additional overhead due to the type coercion process (i.e., `let` is not a number type).
2. **Number() function wrapping around a value:**
	* Pros:
		+ More explicit and safe, as it ensures that the wrapped value is treated as a number.
	* Cons:
		+ May incur additional overhead due to the function call and type coercion process.

**Library usage**

The `Number()` function in JavaScript is part of the built-in library. It takes a string or a number as an argument and returns a number value.

**Special JS feature/syntax**

There's no specific special JS feature or syntax being used here, but note that MeasureThat.net might use other features like async/await or Web Workers for benchmarking purposes.

**Other alternatives**

For creating numbers in JavaScript, developers can also consider using:

* **BigInt**: Introduced in ECMAScript 2020, BigInt provides support for arbitrarily large integers. While not directly related to the `Number()` function comparison, it offers an alternative way to work with numerical values.
* **Typed arrays and typed data types**: Using typed arrays like `Int32Array` or `Float64Array` can provide more efficient arithmetic operations compared to direct number creation.

In summary, the benchmark tests two approaches to creating numbers in JavaScript: using the `let` keyword with an initializer versus wrapping around a value using the `Number()` function. The comparison highlights the trade-offs between readability, safety, and performance considerations for each approach.

Related benchmarks:

number vs Number(number) (version: 0)

Comparing performance of: n vs Number(n)

Created: 5 years ago by: Guest

Jump to the latest result

n

Number(n)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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