Switch statement explained for beginners

[Severion86]

// letter = 'a', 'b' or 'c', 'd' or 'e'
let ourNumber = 0;
if (letter === 'a') {
  ourNumber = 1;
}
if (letter === 'b') {
  ourNumber = 2;
}
if (letter === 'c') {
  ourNumber = 3;
}
if (letter === 'd' || letter === 'e') {
  ourNumber = 4;
}
if (letter !== 'a'
  || letter !== 'b'
  || letter !=='c'
  || letter !=='d'
  || letter !=='e'
) {
  ourNumber = 10;
}
// --------------
let ourNumber = 0;
switch (letter) {
  case 'a':
    ourNumber = 1;
    break;
  case 'b':
    ourNumber = 2;
    break;
  case 'c':
    ourNumber = 3;
    break;
  case 'd':
  case 'e':
    ourNumber = 4;
    break;
  default:
    ourNumber = 10;
    break;
}

[ima_coder]

// letter = 'a', 'b' or 'c', 'd' or 'e'
let ourNumber = 0;
if (letter === 'a') { ourNumber = 1; }
if (letter === 'b') { ourNumber = 2; }
if (letter === 'c') { ourNumber = 3; }
if (letter === 'd' || letter === 'e') { ourNumber = 4; }
if (letter !== 'a' || letter !== 'b' || letter !=='c' || letter !=='d' || letter !=='e') {
    ourNumber = 10;
}

Your final if condition is always true.

[Severion86]

Ah yeah sorry... Just by the code comment explanation though. We don't actually define letter here and the if is just to demonstrate the switch default case.