find permutations to a telefphone number

main.js

var map = {0: ' ', 1: '.', 2: 'abc', 3: 'def', 4: 'ghi', 5: 'jkl', 6: 'mno', 7: 'pqrs', 8:'tuv', 9:'wxyz'};

var number = 4878366;
var out = '';
var endl = '\n';

function getPerms(num, str, map) {
    if (num == 0) {
       out += str + endl;
    } else {
       var curDigit = num % 10;
       var newNum = Math.floor(num / 10);
       var s = map[curDigit];
        for (var i=0; i< s.length; i++) {
            getPerms(newNum, s.charAt(i) + str, map);                    
        }
    }
}

getPerms(number, "", map);
console.log(out);
​