switch

const expr = "Papayas";
switch (expr) {
  case "Oranges":
    console.log("Oranges are $0.59 a pound.");
    break;
  case "Mangoes":
  case "Papayas":
    console.log("Mangoes and papayas are $2.79 a pound.");
    //  : "Mangoes and papayas are $2.79 a pound."
    break;
  default:
    console.log(`Sorry, we are out of ${expr}.`);
}

switch (expression) {
  case caseExpression1:
    statements
  case caseExpression2:
    statements
  // 
  case caseExpressionN:
    statements
  default:
    statements
}

switch (undefined) {
  case console.log(1):
  case console.log(2):
}
// 1  

const foo = 0;
switch (foo) {
  case -1:
    console.log("negative 1");
    break;
  case 0: // foo    ;   
    console.log(0);
  // break !  .
  case 1: // 'case 0:' break    case 
    console.log(1);
    break; // break . 'case 2:'  
  case 2:
    console.log(2);
    break;
  default:
    console.log("default");
}
// 0 1  

const action = "say_hello";
switch (action) {
  case "say_hello":
    const message = "hello";
    console.log(message);
    break;
  case "say_hi":
    const message = "hi";
    console.log(message);
    break;
  default:
    console.log("Empty action received.");
}

const action = "say_hello";
switch (action) {
  case "say_hello": {
    const message = "hello";
    console.log(message);
    break;
  }
  case "say_hi": {
    const message = "hi";
    console.log(message);
    break;
  }
  default: {
    console.log("Empty action received.");
  }
}

switch (expr) {
  case "Oranges":
    console.log("Oranges are $0.59 a pound.");
    break;
  case "Apples":
    console.log("Apples are $0.32 a pound.");
    break;
  case "Bananas":
    console.log("Bananas are $0.48 a pound.");
    break;
  case "Cherries":
    console.log("Cherries are $3.00 a pound.");
    break;
  case "Mangoes":
  case "Papayas":
    console.log("Mangoes and papayas are $2.79 a pound.");
    break;
  default:
    console.log(`Sorry, we are out of ${expr}.`);
}

console.log("Is there anything else you'd like?");

const foo = 5;
switch (foo) {
  case 2:
    console.log(2);
    break; //  break  'default:'  
  default:
    console.log("default");
  // 
  case 1:
    console.log("1");
}

const Animal = "Giraffe";
switch (Animal) {
  case "Cow":
  case "Giraffe":
  case "Dog":
  case "Pig":
    console.log("This animal is not extinct.");
    break;
  case "Dinosaur":
  default:
    console.log("This animal is extinct.");
}

const foo = 1;
let output = "Output: ";
switch (foo) {
  case 0:
    output += "So ";
  case 1:
    output += "What ";
    output += "Is ";
  case 2:
    output += "Your ";
  case 3:
    output += "Name";
  case 4:
    output += "?";
    console.log(output);
    break;
  case 5:
    output += "!";
    console.log(output);
    break;
  default:
    console.log("Please pick a number from 0 to 5!");
}

if ("fetch" in globalThis) {
  // fetch  
} else if ("XMLHttpRequest" in globalThis) {
  // XMLHttpRequest  
} else {
  //    AJAX   
}

switch (true) {
  case "fetch" in globalThis:
    // fetch  
    break;
  case "XMLHttpRequest" in globalThis:
    // XMLHttpRequest  
    break;
  default:
    //    AJAX   
    break;
}

switch (true) {
  case isSquare(shape):
    console.log("This shape is a square.");
  // ,    !
  case isRectangle(shape):
    console.log("This shape is a rectangle.");
  case isQuadrilateral(shape):
    console.log("This shape is a quadrilateral.");
    break;
  case isCircle(shape):
    console.log("This shape is a circle.");
    break;
}