Problem 8. Digit as Word

// Write a program that asks for a digit (0-9), and depending on the input,
// shows the digit as a word (in English).
// * Print “not a digit” in case of invalid input. * Use a switch statement.
// Examples:
// d    result
// 2    two
// 1    one
// 0    zero
// 5    five
//-0.1  not a digit
// hi   not a digit
// 9    nine
// 10   not a digit

let input = ['9'];
let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
//Get the input and converted in number:
let d = Number(gets());
// Switch the digit to word:

switch (d) {
    case 0 :
        console.log('zero');
        break;
    case 1 :
        console.log('One');
        break;
    case 2 :
        console.log('Two');
        break;
    case 3 :
        console.log('Three');
        break;
    case 4 :
        console.log('Four');
        break;
    case 5 :
        console.log('Five');
        break;
    case 6 :
        console.log('Six');
        break;
    case 7 :
        console.log('Seven');
        break;
    case 8 :
        console.log('Eight');
        break;
    case 9 :
        console.log('Nine');
        break;
    case 10 :
        console.log('Ten');
        break;
    case 11 :
        console.log('Eleven');
        break;
    default :
        console.log('not a digit')
}