massCreateWarriors.js

const massCreateWarriors = function(names) {
  return (onCreate) => {
    const warriors = []
    
    names.forEach((name) => {
      const newWarrior = new Warrior(name)
      if (onCreate) onCreate(newWarrior)
      warriors.push(newWarrior)
    })
    
    return warriors
  }
}

const prepareWarriors = massCreateWarriors(['bob', 'joe', 'sally', 'woodie'])

const newWarriors = prepareWarriors(function onCreate(newWarrior) {
  if (newWarrior.name === 'sally') {
    newWarrior.theme = 'red'
  }
  characters.push(newWarrior)
})