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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
Go to the latest result
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>
Run tests (4)
Previous results
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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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=554204" width="100%" height="500px"></iframe>
condition
159.3M/s
splice
136.5M/s
padStart
55.2M/s
362346
51.4M/s
View exact numbers
Test name
Executions per second
✓
condition
159,329,696 Ops/sec
splice
136,477,728 Ops/sec
padStart
55,167,996 Ops/sec
362346
51,377,368 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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`.
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