JavaScript if “x = (a || b || c)” statement not working

Question

I am making a simple trigonometry program in javascript and my if and while statements are not working properly, as they only pass if the first condition is true i.e. if you

Answer 1

I would use an array for the options, and a case statement below:

var opposite = 1
var adjacent = 1
var hypotenuse = 1
var sct = "SohCahToa"
var options = ["Sine", "Cosine", "Tangent"];
while (options.indexOf(sct) < 0) {
  sct = prompt("Sine (unknown adjacent) / Cosine (unkown opposite side) / Tangent (unknown hypotenuse)");
  sct = options[options.indexOf(sct)];
  if (options.indexOf(sct) < 0) {
    alert("Spelling error, please try again");
  }
}
switch (sct) {
  case "Sine":
    hypotenuse = prompt("What is the hypotenuse")
    opposite = prompt("What is the opposite side")
    break;
  case "Cosine":
    hypotenuse = prompt("What is the hypotenuse")
    adjacent = prompt("What is the adjacent side")
    break;
  default:
    opposite = prompt("What is the opposite side")
    adjacent = prompt("What is the adjacent side")
}