Domino's Pizza JavaScript challenge

dominos.js

function say(firstStr) {
	// gotta love currying!
	return function(secondStr) {
		function hyphenSeparate(str) {
			return str.replace(/[.,'"?!]/g, '') // remove punctuation
				  .split('') // split into array of chars
				  .reduce((a, v) => a + '-' + v); // concatenate with hyphens in between
		}
		return hyphenSeparate(firstStr) + ' ' + hyphenSeparate(secondStr);
	}
}

console.log(say('Domino\'s')('Pizza') === 'D-o-m-i-n-o-s P-i-z-z-a');
console.log(say('Front')('End!') === 'F-r-o-n-t E-n-d');