Benchmark: padStart vs splice vs conditional7345734734

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}`
236236
function zeroPad(num, length) { let numStr = num.toString(); let numZeros = length - numStr.length; if (numZeros <= 0) { return numStr; // No padding needed } let padding = ''; while (numZeros > 0) { // Use bitwise operations to efficiently append zeros padding += '0'; numZeros--; } return padding + numStr; } 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
236236

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	54846636.0 Ops/sec
splice	168113568.0 Ops/sec
condition	155154064.0 Ops/sec
236236	64177036.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested, compared, and analyzed in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark is defined by the `Name` field: "padStart vs splice vs conditional7345734734". This indicates that the test is measuring the performance differences between three distinct approaches:

1. `padStart`: a built-in JavaScript method for padding a string with leading zeros.
2. `splice`: an array method for inserting or removing elements, which can be used to achieve similar results as `padStart`.
3. A custom implementation, numbered "condition", which uses a conditional statement to generate the padded string.

**Individual Test Cases**

Each test case represents a separate benchmark:

1. **padStart**: Measures the performance of using `padStart` with an initial value of 5 and a desired length of 2.
2. **splice**: Measures the performance of using `splice` with an array containing the value 5, inserting zeros until the string reaches a length of 2.
3. **condition**: Measures the performance of a custom implementation that uses a conditional statement to generate the padded string.

**Library Usage**

None of the test cases explicitly use any external libraries.

**Special JS Features/Syntax**

* `padStart` and `splice` are built-in JavaScript methods and do not rely on special features or syntax.
* The "condition" implementation uses a simple conditional statement (`x<10 ? '0' + x : x`), which is a standard JavaScript feature.

**Pros and Cons of Each Approach**

1. **padStart**:
	* Pros: concise, efficient, and well-documented.
	* Cons: relies on the `padStart` method being available and supported by all browsers.
2. **splice**:
	* Pros: flexible, can be used with arrays, and does not rely on `padStart`.
	* Cons: more verbose, requires creating an array, and may incur overhead due to the operation.
3. **condition**:
	* Pros: custom implementation allows for fine-tuning performance-critical code.
	* Cons: more complex, relies on manual string manipulation, and may introduce overhead.

**Other Alternatives**

If you need to pad strings in JavaScript, some alternative approaches could be:

1. Using `String.prototype.padStart()` (if supported by the browser).
2. Creating a custom padding function using bitwise operations or other optimization techniques.
3. Using a library like `lodash` or `string-pad`, which provide optimized padding functions.

Keep in mind that each approach has its trade-offs, and the choice of method depends on the specific use case, performance requirements, and compatibility with different browsers and environments.

Related benchmarks:

padStart vs splice vs conditional7345734734 (version: 0)

Measures speed between using padStart and splice and conditional

Comparing performance of: padStart vs splice vs condition vs 236236

Created: one year ago by: Guest

Jump to the latest result

padStart

splice

condition

236236

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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