JavaScript Multiple Identical Options in Switch Statements

In JavaScript, the switch statement is a powerful tool used to evaluate multiple conditions and execute different blocks of code based on those conditions. With the switch statement, you can check for multiple conditions within a single statement without having to write multiple if-else statements.

However, there are times when you may need to use the same code for multiple conditions. In such cases, you can use multiple identical options in the switch statement. This tutorial will show you how to use multiple identical options in a JavaScript switch statement.

Syntax

The syntax for using multiple identical options in a JavaScript switch statement is as follows:

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switch (expression) {
  case option1:
  case option2:
  ...
  case optionN:
    // code block
    break;
  ...
}

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Here, the expression is evaluated and compared to each of the options. If a match is found, the code block associated with the option is executed. The break statement is used to terminate the switch statement. If the break statement is omitted, the code will continue to run until the end of the switch statement.

Example

Let’s take a look at an example. Consider the following switch statement:

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var number = 3;

switch (number) {
  case 1:
    console.log('Number is 1');
    break;
  case 2:
    console.log('Number is 2');
    break;
  case 3:
  case 4:
    console.log('Number is 3 or 4');
    break;
}

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In this example, the expression is a variable called number with the value 3. The switch statement checks for the value of the expression and compares it to each of the options. When it finds a match, the code block associated with the option is executed. In this case, the code block associated with the option 3 is executed.

Since the option 3 and option 4 have identical code blocks, they can be combined into one option. This is what the code looks like using multiple identical options:

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var number = 3;

switch (number) {
  case 1:
    console.log('Number is 1');
    break;
  case 2:
    console.log('Number is 2');
    break;
  case 3:
  case 4:
    console.log('Number is 3 or 4');
    break;
}

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Here, the code block associated with option 3 is also executed when option 4 matches. As you can see, this is a much more efficient way to write the switch statement.

Conclusion

In this tutorial, we have discussed how to use multiple identical options in a JavaScript switch statement. This is a powerful technique that can be used to simplify your code and make it more efficient. We hope you have found this tutorial helpful.