Multiple i"if" values? [duplicate]

Question

I have made my first js script and I was wondering, is it possible to add multiple values to a "if var =="

var day = window.prompt("How was your day? Describe it in 1 word!");

if (day == null, "bad", "terrible") {
    document.write("How come?");
} else {
    document.write("sounds great");
}

I expect it to give a different response ONLY if the var day is bad or terrible. Not for any other responses!

But the output is only

Answer 1

if (day == null || day == "bad" || day == "terrible") {
    document.write("How come?");
} else {
    document.write("sounds great");
}

Answer 2

You could use the switch statement.

switch (day) {
  case "bad":
  case "terrible":{ document.write("How come?"); } break;
  default: { document.write("sounds great"); } break;
}

So, in you case:

var day = window.prompt("How was your day? Describe it in 1 word!");
switch (day) {
   case "bad":
   case "terrible":{ document.write("How come?"); } break;
   default: { document.write("sounds great"); } break;
}