Last Digit of Number

/* Write a JavaScript function lastDigitAsText(number) that returns the last digit of given integer as
an English word. Write a JS program lastDigitOfNumber.js that invokes your function with the sample input data
below and prints the output at the console. */

"use strict";

function lastDigitAsText(number) {
    number = Math.abs(number);
    var lastDigit = number % 10;
    switch (lastDigit) {
        case 0:
            return 'Zero';
            break;
        case 1:
            return 'One';
            break;
        case 2:
            return 'Two';
            break;
        case 3:
            return 'Three';
            break;
        case 4:
            return 'Four';
            break;
        case 5:
            return 'Five';
            break;
        case 6:
            return 'Six';
            break;
        case 7:
            return 'Seven';
            break;
        case 8:
            return 'Eight';
            break;
        case 9:
            return 'Nine';
            break;
        default:
            return 'That is not a Digit!!!';
            break;
    }
}

console.log(lastDigitAsText(6));
console.log(lastDigitAsText(-55));
console.log(lastDigitAsText(133));
console.log(lastDigitAsText(14567));
console.log(lastDigitAsText(0));
console.log(lastDigitAsText('42'));
console.log(lastDigitAsText('x'));