Numbers

var arr = [];
for (var i = 0; i < test.length; i++) {

    arr.push(test[i]);
}

var code = [];

for (var y= 0; y < arr.length; y++) {

if (arr[y].substring(0, arr[y].length-2)==='set') {
    code[y] = 'set';
}

if (arr[y].substring(0, arr[y].length-2)==='front-add') {
    code[y] = 'front-add';
}

if (arr[y].substring(0, arr[y].length-2)==='back-add') {
    code[y] = 'back-add';
}

if (arr[y]==='print') {
    code[y] = 'print';
}

if (arr[y]==='front-remove') {
    code[y] = 'front-remove';
}

if (arr[y]==='back-remove') {
    code[y] = 'back-remove';
}

if (arr[y]==='reverse') {
    code[y] = 'reverse';
}

if (arr[y]==='end') {
    code[y] = 'end';
}

}


for (var x=0; x < code.length; x++) {

switch(code[x]) {

    case 'set':

        var result = arr[x].slice(-1);

    break;

    case 'front-add':
        var  digit1 = arr[x].slice(-1);
        result = digit1 + result;
    break;

    case 'back-add':
        var  digit2 = arr[x].slice(-1);
        result = result + digit2;
    break;

    case 'front-remove':
        result = result.slice(1);
        break;

    case 'print':
        print(result);
    break;

    case 'back-remove':
        result = result.substring(0, result.length-1);
        break;

    case 'reverse':
        result = result.split("").reverse().join("");
        break;

    case 'end':
    code[x +1] = '';
    break;

}

}