toCamelCase performance test (v2)

Revision 2 of this benchmark created on May 9, 2023

Setup

let str = "This is an Example-String!";

function toCamelCase1(str) {
  // replace all non-alphanumeric characters with space
  str = str.replace(/[^a-zA-Z0-9]/g, ' ');
  
  // convert the first letter of each word to uppercase
  str = str.replace(/(?:^\w|[A-Z]|\b\w)/g, function(word, index) {
    return index === 0 ? word.toLowerCase() : word.toUpperCase();
  }).replace(/\s+/g, ''); // remove all spaces

  return str;
}

function toCamelCase2(str) {
  let words = str.split(/[^a-zA-Z0-9]/); // split the string into an array of words
  let camelCaseStr = words[0].toLowerCase(); // convert the first word to lowercase

  // convert the first letter of each subsequent word to uppercase and append to the camel case string
  for (let i = 1; i < words.length; i++) {
    let capitalizedWord = words[i].charAt(0).toUpperCase() + words[i].slice(1).toLowerCase();
    camelCaseStr += capitalizedWord;
  }

  return camelCaseStr;
}

function toCamelCase3(str) {
  let words = str.split(/[^a-zA-Z0-9]/); // split the string into an array of words
  let camelCaseArr = [words[0].toLowerCase()]; // convert the first word to lowercase and add it to the array

  // convert the first letter of each subsequent word to uppercase and add it to the array
  for (let i = 1; i < words.length; i++) {
    let capitalizedWord = words[i].charAt(0).toUpperCase() + words[i].slice(1).toLowerCase();
    camelCaseArr.push(capitalizedWord);
  }

  return camelCaseArr.join(''); // join the array elements into a single string
}

function toCamelCase4(str) {
  let words = str.split(/[^a-zA-Z0-9]/); // split the string into an array of words
  let camelCaseArr = [words[0].toLowerCase()]; // convert the first word to lowercase and add it to the array

  // convert the first letter of each subsequent word to uppercase and add it to the array
  for (let i = 1; i < words.length; i++) {
camelCaseArr.push(words[i].charAt(0).toUpperCase());
camelCaseArr.push(words[i].slice(1).toLowerCase());
  }

  return camelCaseArr.join(''); // join the array elements into a single string
}

// dot't remove incorrect char'
function toCamelCase5(str) {
 return str.replace(/[_ -]+([a-z])/gi, (_, c) => c.toUpperCase())	
}

Teardown

Test runner

toCamelCase1(str)

toCamelCase2(str)

toCamelCase3(str)

toCamelCase4(str)

toCamelCase5(str)

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on May 9, 2023
• Revision 2: published on May 9, 2023