Promises Practice

promises-practice.js

const makeAllCaps = (words) => {
	return new Promise((resolve, reject) => {
		if (words.every((checkWord)) {
			resolve(words.map(word => word.toUpperCase()))
		} else {
			reject('Invalid entry')
		}
	})
};

const sortWords = (words) => {
	return new Promise((resolve, reject) => {
		resolve(words.sort((a, b) => a - b))
	})
};

const checkWord = (word) => {
	return Object.isString(word)
}

const greek = ['alpha', 'beta', 'gamma']

makeAllCaps(greek)
  .then(words => sortWords(words))
  .then(result => console.log(result))
  .catch(error => console.log(error))