function permutations(word){
	if(word.length <=1) return [word];
	if(typeof word === 'string'){
		word = word.split('')
	}
	if(typeof word === 'number'){
		word = String(word).split('')
	}
	
	let permutationCollection = [];
	let nextWord = [];
	let characters = [];
	
	permute(word);

	return permutationCollection

	function permute(characters){
		if(characters.length < 1){
			// add word to permutations array
			permutationCollection.push(nextWord.join(''));
		}
		for(let i = 0; i < characters.length; i++){
			characters.push(characters.shift());
			nextWord.push(characters[0])
			permute(characters.slice(1););
			nextWord.pop();
		}
	}
}