Benchmark: padStart vs splice vs conditional721345734734

Tests:

padStart
let x = 5; let res = ("" + x).padStart(2, "0")
splice
let x = 5; let res = ("0" + x).slice(-2)
condition
let x = 5; let res = x<10 ? `0${x}` : `${x}`
362346
function zeroPad(number, length) { // 숫자를 문자열로 변환 let str = number.toString(); // 지정된 길이에 도달할 때까지 앞에 '0'을 추가 while (str.length < length) { str = '0' + str; } return str; } let x = 5; let res = zeroPad(x, 2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
padStart
splice
condition
362346

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/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
padStart	55167996.0 Ops/sec
splice	136477728.0 Ops/sec
condition	159329696.0 Ops/sec
362346	51377368.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided JSON represents a benchmark test suite for comparing the performance of three different approaches to pad or add leading zeros to an integer value:

1. `padStart`
2. `splice` (using string slicing)
3. A custom function called `zeroPad`

**Options Compared**

* `padStart`: The built-in JavaScript method `String.prototype.padStart()` that pads a string with a specified character (in this case, '0') until it reaches a certain length.
* `splice`: The `slice()` method used to extract a part of the string and then concatenating it back into the original string using the `+` operator. This approach is often slower than `padStart`.
* `zeroPad`: A custom function that converts an integer value to a string, pads it with leading zeros until it reaches a specified length, and returns the resulting string.

**Pros and Cons of Each Approach**

* `padStart`:
	+ Pros: Built-in method, efficient, and easy to use.
	+ Cons: May not be optimized for certain edge cases or browser versions.
* `splice`:
	+ Pros: Can be useful in specific scenarios where a custom solution is needed.
	+ Cons: Generally slower than `padStart`, and can lead to unnecessary string concatenations.
* `zeroPad`:
	+ Pros: Customizable, can handle edge cases, and provides better control over the padding process.
	+ Cons: Slower than `padStart`, requires more code and maintenance.

**Library Usage**

None of the test cases use any external libraries or dependencies. The `zeroPad` function is a custom implementation written in JavaScript.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark test suite that would require deep knowledge of JavaScript.

**Other Alternatives**

If you're looking for alternative approaches to pad or add leading zeros, you might consider using:

* `String.prototype.padEnd()`: Similar to `padStart`, but pads the string with a specified character on both ends.
* Regular expressions: You can use regular expressions to pad strings with leading zeros, but this approach may be slower than the built-in methods.
* String formatting libraries: Some libraries like Moment.js or date-fns provide formatting functions that can be used for padding integers.

Keep in mind that when dealing with performance-critical code, it's often better to stick with the most efficient and well-tested solutions, such as `padStart`.

Related benchmarks:

padStart vs splice vs conditional721345734734 (version: 0)

Measures speed between using padStart and splice and conditional

Comparing performance of: padStart vs splice vs condition vs 362346

Created: one year ago by: Guest

Jump to the latest result

padStart

splice

condition

362346

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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