code: function camelCase (str, capitaliseLead = false) {
    str = str.replace(/_([a-z])/g, (group) => {
      if (group[1]) {
        return group[1].toUpperCase()
      }
    })
    if (capitaliseLead) {
      return str.charAt(0).toUpperCase() + str.slice(1)
    } else {
      return str
    }
  }
docs: CamelCase
  @param  {String} str String with "under_score"
  @return {String} UnderScore is now CamelCased