var strIn = "abcdefghijklmnopqrstuvwxyz";
var strOut = '';
const capt = (str) => {
let str_split = str.split("");
str_split.forEach((str_sub, ind) => { str_split[ind] = ((ind === 0) ? str_sub.toUpperCase() : str_sub)});
return str_split.join("");
};
strOut = capt(strIn);
const captSlice = (str) => str.charAt(0).toUpperCase() + str.slice(1);
strOut = captSlice(strIn);
const captReg = (str) => str.replace(/^(\w)/, $1 => $1.toUpperCase())
strOut = captReg(strIn)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Luke | |
Slice | |
Danny |
Test name | Executions per second |
---|---|
Luke | 910234.6 Ops/sec |
Slice | 3411640.0 Ops/sec |
Danny | 533824.6 Ops/sec |
Let's break down the provided JSON data and explain what is tested in the benchmark.
Benchmark Definition
The benchmark definition represents a JavaScript function that takes a string as input and returns the capitalized version of the string, excluding the first character if it's uppercase. The function uses the split()
, forEach()
, and join()
methods to achieve this.
Options Compared
There are three options compared in the benchmark:
toUpperCase()
: This option uses the toUpperCase()
method to capitalize each substring of the input string, starting from the second character (str_sub
).charAt(0).toUpperCase() + str.slice(1)
: This option uses the charAt(0)
method to get the first character of the input string and converts it to uppercase using the toUpperCase()
method, while ignoring the rest of the characters.replace()
: This option uses a regular expression to replace the first character of the input string with its uppercase equivalent.Pros and Cons
Here are some pros and cons for each option:
toUpperCase()
:charAt(0).toUpperCase() + str.slice(1)
:toUpperCase()
since it only needs to call two methods instead of one.replace()
:Library
None of the provided benchmark definitions use any external libraries. However, it's worth noting that if you were to write a similar function in a production environment, you might consider using libraries like Lodash or Underscore.js to simplify the code and improve performance.
Special JS Feature/Syntax
There is no special JavaScript feature or syntax used in these benchmark definitions. They only use standard JavaScript features like split()
, forEach()
, join()
, charAt()
, and toUpperCase()
.
Alternatives
If you're interested in exploring alternative approaches to this problem, here are some options:
String.prototype.toLocaleUpperCase()
: This method can be used to capitalize the first character of each substring of the input string, starting from the second character.match()
, map()
, and join()
: This approach can potentially be faster than using individual methods like split()
, forEach()
, and join()
.