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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
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}`
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>
Run tests (4)
Previous results
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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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=554203" width="100%" height="500px"></iframe>
splice
168.1M/s
condition
155.2M/s
236236
64.2M/s
padStart
54.8M/s
View exact numbers
Test name
Executions per second
✓
splice
168,113,568 Ops/sec
condition
155,154,064 Ops/sec
236236
64,177,036 Ops/sec
padStart
54,846,636 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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