学ぶ switch Statements | Understanding Program Flow and Decisions

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Imagine you are standing in front of a vending machine filled with snacks. Each snack has a number below it. You simply press the number of the snack you want, and the machine gives it to you. This is a lot like how a switch statement works in JavaScript. You have a single value (like the number you press), and the code chooses the right action based on that value. Instead of checking every possibility with a long chain of if...else if statements, you can use a switch to make your code clearer and easier to read.


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// Choose a snack based on the selected number
let snackNumber = 2;
let snack;

switch (snackNumber) {
  case 1:
    snack = "Chips";
    break;
  case 2:
    snack = "Chocolate Bar";
    break;
  case 3:
    snack = "Granola Bar";
    break;
  default:
    snack = "Unknown snack";
}

console.log("You chose: " + snack);

1. When is a `switch` statement more useful than multiple `if...else if` statements?

2. Complete the switch statement so that it sets 'snack' to 'Granola Bar' when 'snackNumber' is 3.

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セクション 1. 章 5

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セクション 1. 章 5

switch Statements

1. When is a switch statement more useful than multiple if...else if statements?

2. Complete the switch statement so that it sets 'snack' to 'Granola Bar' when 'snackNumber' is 3.

1. When is a `switch` statement more useful than multiple `if...else if` statements?