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padStart vs splice vs conditional
(version: 0)
Measures speed between using padStart and splice and conditional
Comparing performance of:
padStart vs splice vs condition
Created:
4 years 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}`
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
padStart
splice
condition
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 134 on Android
View result in a separate tab
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=594089" width="100%" height="500px"></iframe>
splice
73.5M/s
condition
68.6M/s
padStart
27.1M/s
View exact numbers
Test name
Executions per second
✓
splice
73,546,632 Ops/sec
condition
68,643,776 Ops/sec
padStart
27,122,760 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases to understand what's being tested. **Benchmark Overview** The benchmark, hosted on MeasureThat.net, allows users to create and run JavaScript microbenchmarks. The current benchmark compares three different approaches for padding or formatting strings: 1. `padStart` 2. `splice` (specifically, using `slice(-2)` to get the last two characters of a string) 3. A conditional approach that uses template literals with an empty string (`"0${x}"`) if the condition is true and the original string (``${x}``) otherwise. **Test Cases** There are three test cases: 1. `padStart`: Measures the speed of using `padStart` to pad a string with zeros. 2. `splice`: Measures the speed of using `slice(-2)` to get the last two characters of a string. 3. `condition`: Measures the speed of the conditional approach using template literals. **Approaches Compared** The three approaches are compared in terms of their execution time (measured in executions per second). The benchmark aims to determine which approach is faster. **Pros and Cons of Each Approach:** 1. **padStart** * Pros: + More readable and concise syntax + No risk of buffer overflow or string manipulation errors * Cons: + May not be as efficient as other approaches due to the use of a built-in method 2. **splice** * Pros: + Can be faster than `padStart` in some cases, as it only requires getting the last two characters of the string * Cons: + Risk of buffer overflow or string manipulation errors if not used carefully + May not be as readable or concise as `padStart` 3. **Condition** * Pros: + Can be more efficient than `padStart` in some cases, as it avoids the overhead of a built-in method and uses template literals * Cons: + More complex syntax, which may make it harder to read or maintain **Library Used** None, as this benchmark is purely testing JavaScript core functionality. **Special JS Features or Syntax** The `condition` test case uses template literals with the conditional operator (`?:`) and string concatenation (`"0${x}"`). The syntax for this approach was introduced in ECMAScript 2015 (ES6) to make it easier to perform string interpolation.
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