Discussion on: JavaScript Challenge 6: Convert string to camel case

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Since split already uses g as regex mod... and there is no need to use i when you are not looking for [a-z|A-Z] chars...

const toCamelCase = string => {
  const [head, ...tail] = string.split(/-|_/)
    .map(([head, ...tail]) => 
      [
        head.toUpperCase(),
        tail.join('').toLowerCase()
      ].join(''))
    .join('')
  return [head.toLowerCase(), ...tail].join('')
}

console.log(toCamelCase('THE_awesome-and_sUPERB-stealth-WARRIOR'))
//theAwesomeAndSuperbStealthWarrior

Also added some valiations to fix improper output camelCase casing

AlbertoM • Oct 27 '20

Awesome, one thing. Your output theAwesomeAndSuperbStealthWarrior should have the first letter be capitalized since it was like that in the original string.

See the challenge requirement:

"The first word within the output should be capitalized only if the original word was capitalized (known as Upper Camel Case, also often referred to as Pascal case)."

Zero Dragon • Oct 27 '20

You are correct! here is the revisited version:

const toCamelCase = ([first, ...rest]) => {
  const [head, ...tail] = rest.join('').split(/-|_/)
    .map(([head, ...tail]) => 
      [
        head.toUpperCase(),
        tail.join('').toLowerCase()
      ].join(''))
    .join('')
  return [first, head.toLowerCase(), ...tail].join('')
}

console.log(toCamelCase('THE_awesome-and_sUPERB-stealth-WARRIOR'))
console.log(toCamelCase('tHE_awesome-and_sUPERB-stealth-WARRIOR'))

// TheAwesomeAndSuperbStealthWarrior
// theAwesomeAndSuperbStealthWarrior

darn PascalCase...