English Name оf The Last Digit

/**
 * Created by Yavor on 26/10/2016.
 */
function solve(arr){
    var str=arr[0];
    var number=parseInt(str.substring(arr[0].length-1));
    var word = toWord(number);
    console.log(word);
    function toWord(number){
        switch(number){
            case 0:
                number="zero";
                break;
            case 1:
                number="one";
                break;
            case 2:
                number="two";
                break;
            case 3:
                number="three";
                break;
            case 4:
                number="four";
                break;
            case 5:
                number="five";
                break;
            case 6:
                number="six";
                break;
            case 7:
                number="seven";
                break;
            case 8:
                number="eight";
                break;
            case 9:
                number="nine";
                break;
            default:
                break;
        }
        return number;
    }
}
//solve(["9223372036854775806"]);