Benchmark: parseInt vs. substring

Tests:

String
var test = (new Date().getTime() + '').substring(0,6);
Int
var test = parseInt(new Date().getTime() / 10000000, 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String
Int

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!

**What is being tested?**

The provided JSON represents two benchmark test cases:

1. **String**: This test case measures the performance of converting a specific string using `substring` and `+` (string concatenation) operators.
2. **Int**: This test case measures the performance of converting an integer value using `parseInt` with a radix of 10.

**Options compared**

In each test case, two options are being compared:

* For the **String** test:
	+ Option A: Using `substring` and `+` operators to convert a string.
	+ Option B: Using `+` operator alone without `substring`.
* For the **Int** test:
	+ Option A: Using `parseInt` with a radix of 10.
	+ Option B: Not using `parseInt`.

**Pros and Cons**

Here are some pros and cons for each option:

* **String**:
	+ Option A (`substring` + `+`):
		- Pros: Can handle a wide range of input values, including negative numbers and non-numeric characters.
		- Cons: May incur additional overhead due to the use of `substring`, which can be slower than using only the `+` operator.
	+ Option B (`+` alone):
		- Pros: Faster execution time, as it avoids the extra function call and potential overhead of `substring`.
		- Cons: Limited to numeric values only, may not work correctly for negative numbers or non-numeric characters.
* **Int**:
	+ Option A (`parseInt` with radix 10):
		- Pros: Provides a way to specify the radix, which can be useful for converting decimal values.
		- Cons: May incur additional overhead due to the use of `parseInt`.
	+ Option B (not using `parseInt`):
		- Pros: Faster execution time, as it avoids the extra function call and potential overhead of `parseInt`.
		- Cons: Limited to integer values only.

**Library usage**

In both test cases, no external libraries are being used. The `substring` function is a built-in JavaScript method, while `parseInt` is also a built-in function in modern browsers.

**Special JS features or syntax**

There are no special JavaScript features or syntax being used in these benchmark test cases. However, it's worth noting that the use of `+` operator alone (Option B) relies on the fact that the `+` operator can be overloaded to perform different operations depending on its arguments. This is a common JavaScript feature, but not explicitly mentioned in this explanation.

**Other alternatives**

For similar benchmarking purposes, other alternatives could include:

* Using `Number()` function instead of `parseInt`
* Comparing with other string manipulation functions like `slice()`, `substr()`, or regex
* Including tests for other numeric formats, such as hexadecimal or binary strings
* Incorporating tests for browser-specific optimizations or performance modes (e.g., Safari's `-Oz` mode)

Keep in mind that these alternatives would require modifications to the benchmark test cases and preparation code.

Related benchmarks:

parseInt vs. substring (version: 0)

Comparing performance of: String vs Int

Created: 9 years ago by: Guest

Jump to the latest result

String

Int

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):