Compare if a-z or A-Z and give output with switch JavaScript function

Question

I'm learning JavaScript. Very new and know basic. I'm playing with various options of JavaScript.

I'm comparing a-z (lower case) and A-Z (upper case) from user input. and giving an answer base on the input.

Normally i can do this with this long code:

var x = prompt("Enter Your character");
switch (x) {
    case 'a':
    case 'b':
    case 'c':
    case 'd':
    case 'e':
    case 'f':
    case 'g':
    case 'h':
    case 'i':
    case 'j':
    case 'k':
    case 'l':
    case 'm':
    case 'n':
    case 'o':
    case 'p':
    case 'q':
    case 'r':
    case 's':
    case 't':
    case 'u':
    case 'v':
    case 'w':
    case 'x':
    case 'y':
    case 'z':
        document.write("Lower case");
        break;
    case 'A':
    case 'B':
    case 'C':
    case 'D':
    case 'E':
    case 'F':
    case 'G':
    case 'H':
    case 'I':
    case 'J':
    case 'K':
    case 'L':
    case 'M':
    case 'N':
    case 'O':
    case 'P':
    case 'Q':
    case 'R':
    case 'T':
    case 'U':
    case 'V':
    case 'W':
    case 'X':
    case 'Y':
    case 'Z':
        document.write("Upper case");
        break;
    default:
        document.write("It is number");
        break;
}

With switch I want to achieve same output but with less code! Something like this:

var x = prompt("Enter Your character");
switch(x) {
    case x >= 'a'|| x <= 'z':
        document.write("Lower case");
        break;

    case x >= 'A' || x <= 'Z':
        document.write("Upper case");
        break;

    default:
        document.write("It is number");
        break;
}

Any Help?

Please I want to do this with only switch function. I know i can do this with if/else function but i want to do this with switch. If its not possible with switch let me know :-)

Answer 1

The switch statement compares the input expression with each case statement using strict comparison.

So use true inside the switch clause and specify expressions that evaluate to true in case clause:

var x = prompt("Enter Your character");
switch (true) {
  case x >= "a" && x <= "z":
    alert("Lower case");
    break;
  case x >= "A" && x <= "Z":
    alert("Upper case");
    break;
  default:
    alert("Something else");
    break;
}

I personally do not recommend this. This is only for learning.