How to use

upperCase

function

in

lodash

export function formatLanguageLocale(data) {
 const array = [];

 forEach(split(data, '_'), (value, key) => {
  if (key === 0){
   array.push(toLower(value));
  } else {
   array.push(upperCase(value));
  }
 });

 return array;
}

function isState(s) {
  const isUpperCase = c => upperCase(c) === c;
  return filter(s, isUpperCase).length === 2;
}