var strIn = "monkeybananaparrotmonkeybananaparrotmonkeybananaparrotmonkeybananaparrot";
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 | 586043.9 Ops/sec |
Slice | 3972389.5 Ops/sec |
Danny | 1292347.2 Ops/sec |
Let's break down the provided benchmark and explain what's being tested.
Benchmark Overview
The benchmark is designed to measure the performance of JavaScript strings manipulation, specifically capitalizing the first letter of each word in a given string.
Options Compared
Three options are compared:
split()
, forEach()
, and join()
**: This approach splits the input string into an array, iterates over it using forEach()
, and then joins the modified substrings back together.charAt(0)
and toUpperCase()
: This approach simply extracts the first character of the input string and converts it to uppercase using the toUpperCase()
method.replace()
: This approach uses a regular expression to match the beginning of each word and replaces it with its uppercase equivalent.Pros and Cons
forEach()
, and join()
**:charAt(0)
and toUpperCase()
:replace()
:Library Usage
None of the benchmark tests use any external libraries or frameworks.
Special JS Features/Syntax
None of the benchmark tests use any advanced JavaScript features or syntax.
Other Alternatives
If you wanted to compare these options, you could also consider:
substring()
and toUpperCase()
: This approach extracts a substring starting from the beginning of the input string and converts it to uppercase.Here's some sample benchmarking code using Node.js:
const strIn = "monkeybananaparrotmonkeybananaparrotmonkeybananaparrotmonkeybananaparrot";
let strOut;
// Option 1: Using split(), forEach(), and join()
strOut = (function() {
let str_split = strIn.split("");
str_split.forEach((str_sub, ind) => {
str_split[ind] = ((ind === 0) ? str_sub.toUpperCase() : str_sub);
});
return str_split.join("");
})();
// Option 2: Using charAt(0) and toUpperCase()
strOut = (function() {
return strIn.charAt(0).toUpperCase() + strIn.slice(1);
})();
// Option 3: Using a regular expression with replace()
strOut = (function() {
return strIn.replace(/^(\\w)/, $1 => $1.toUpperCase());
})();
console.log(strOut); // Output: MonkeyBananaParrotMonkeyBananaParrotMonkeyBananaParrotMonkeyBananaParrot
This code defines a simple benchmark function for each option and measures the execution time using console.time()
. You can modify this code to compare the performance of these options.