Javascript Switch Statement

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Delve into the complex world of Javascript Switch Statements with this comprehensive guide. Whether you're a novice or an experienced coder, understanding the intricacies of this feature is paramount to advancing your skills. Explore what Javascript Switch Statements are, why they are used, and how they work, through in-depth explanations and practical examples. This guide also tackles advanced concepts, explores alternatives and provides solutions to common issues, ensuring you have all the necessary knowledge to command the Javascript Switch Statement effectively.

Introduction to Javascript Switch Statement

Before plunging into the intricacies of the Javascript Switch Statement, it's pivotal to familiarize yourself with some basic Javascript premises. Javascript, as a dynamic scripting language, uses various programming structures like variables, operators, loops, and conditions to devise complex operations. Among these conditions, lies the Javascript Switch statement.

The Javascript Switch statement is a multiple-choice programming structure, which selects a 'switch' based on the 'case' conditions, and executes a block of code associated with that case.

Understanding the Javascript switch statement

Exploring the inner mechanisms of the Javascript Switch Statement, you'll notice it permits a variable to be tested for equality against a list of values. Each value is called a 'case', and the variable being switched on is checked for each switch 'case'.

Here is a basic example:

 
switch(expression) {
  case x:
    // code block
    break;
  case y:
    // code block
    break;
  default:
    // code block
}

In this Javascript syntax, the 'expression' is compared with the values of each 'case'. If there's a match, the corresponding block of code is executed.

Why does Javascript have switch statements?

Javascript Switch Statements aim to simplify complex or lengthy 'if...else' statements where multiple conditions need to be evaluated. This use saves computational power and makes code cleaning more efficient.

When working with operations that have numerous conditions, Javascript Switch Statements can save time and resources in programming. They are particularly useful when you need to execute different actions for different decisions.

The purposes and benefits of Javascript switch statements

Utilising Javascript Switch Statements in your code has multiple benefits. Some of the primary purposes and gains are:

Enhanced readability and organization of code, as the Switch statement uses fewer lines of code than multiple 'if...else' conditions.
It offers a 'default' condition that gets executed when none of the 'case' conditions meet the specified expression.
It promotes cleaner and more professional coding practices.

Often, Javascript switch statements help in scenarios like creating a simple calculator function. For example:

switch(operator) {
  case '+':
    result = num1 + num2;
    break;
  case '-':
    result = num1 - num2;
    break;
  case '*':
    result = num1 * num2;
    break;
  case '/':
    result = num1 / num2;
    break;
  default:
    result = "Invalid operator";
}

This example showcases a basic calculator function using a switch statement in Javascript. The switch checks the 'operator' variable and executes the corresponding operation within its case.

The Structure of Javascript Switch Statement

Unlocking the structure of the Javascript Switch Statement is integral to solidifying your proficiency in Javascript programming. By gaining a deeper understanding of its construct, you will be harnessing the power to simplify lengthy conditional checks in your coding practices. Swim through the sea of Javascript's numerous 'case' conditions and pinpoint each of them effortlessly with the Switch Statement.

Breaking down the syntax of Javascript switch statement

Diving into the anatomy of the Javascript Switch Statement, it's observed to have a unique syntax, composed of the 'switch', 'case', 'break', and 'default' statements. Each plays a pivotal role, contributing to its functionality.

The 'switch' statement signifies the start of the switch code block. This block allows for multiple possible execution paths.
The 'case' statement contains the value that the ‘switch’ expression is compared with. If there's a match, the code block following the 'case' statement is executed.
The 'break' statement signifies the end of each 'case'. It's essential because, without it, the script would run into the next 'case'
The 'default' statement (optional) executes if none of the case values match the 'switch' expression.

Anatomy of a switch statement:

switch(expression) {
  case value1:
    //Statement
    break;
  case value2:
    //Statement
    break;
  default:
    //Default Statement
}

This detailed breakdown makes it easier to understand the syntax of a Javascript switch statement.

Javascript switch statement: dealing with multiple cases

One of the unique features of the Javascript Switch Statement is its ability to deal with multiple case scenarios. It helps in managing numerous conditions that need testing for equality against a list of values. It carries out this process by pairing every 'case' with a 'switch', forming a switch-case pair. When the 'switch' matches a 'case', the associated block of code is executed.

To illustrate,

switch(dayOfWeek) {
  case 'Monday':
    console.log("Start of the work week.");
    break;
  case 'Friday':
    console.log("End of the work week.");
    break;
  default:
    console.log("It's a regular workday.");
}

In this scenario, the switch statement helps distinguish weekdays and exemplifies the mechanism of dealing with multiple case scenarios.

Using switch statements to handle multiple conditions

A major advantage of the Javascript Switch Statement is its capacity to handle multiple conditions with ease. Each 'case' within the statement can have its own conditions that need to be satisfied in order to be executed, taking the form of an expression in the parentheses following the 'case' keyword.

For instance,

switch(day) {
  case (day === 'Sunday' || day === 'Saturday') :
    console.log("It's the weekend!");
    break;
  default:
    console.log("Still in the work week.");
}

This code snippet demonstrates how a switch statement can accommodate multiple conditions within a single case. Here, when either of the conditions in the case ('Sunday' or 'Saturday') is true, a single output is printed.

Practical Javascript Switch Statement Examples

As you journey through the world of Javascript programming, it's always helpful to explore real-world examples of various constructs. It's no different when it comes to the Javascript Switch Statement. By dissecting practical samples and analysing their workings, you can solidify your understanding and master the art of the Switch Statement's application. Let's get you hands-on with a couple of illustrative examples.

How to use a switch statement in Javascript: step by step guide

Let's commence your journey by crafting a simple Switch statement from scratch. You'll be creating a piece of code that determines which day of the week it is. This tutorial takes a hands-on, pedagogical approach, guiding you through every step of writing a switch statement with detailed explanations.

Step 1: First, create a variable to hold your switch expression. In this case, use a new Date object to represent the current date:
```
let date = new Date();
```
Step 2: Next, procure the day of the week using the getDay() method which returns a number from 0 (Sunday) to 6 (Saturday):
```
let dayOfWeek = date.getDay();
```
Step 3: Now, it's time to create the switch statement. Assign the dayOfWeek variable as the switch expression:
```
switch(dayOfWeek) {
  // cases will be inserted here
}
```

Step 4: Inside your switch block, you will create seven 'case' statements, each representing a day of the week. Break after each ‘case’ statement helps in exiting the switch block once a matching case is found:

switch(dayOfWeek) {
  case 0:
    console.log("Sunday");
    break;
  case 1:
    console.log("Monday");
    break;
  case 2:
    console.log("Tuesday");
    break;
  case 3:
    console.log("Wednesday");
    break;
  case 4:
    console.log("Thursday");
    break;
  case 5:
    console.log("Friday");
    break;
  case 6:
    console.log("Saturday");
    break;
}

Examining a Javascript switch statement string example

Moving onto using the switch statement with strings, it's interesting to note that Javascript switch statements aren't restricted to numbers and can operate correctly with strings. Let's delve into an example where you have an application that has several access levels (Admin, Editor, User), and depending on the role, different privileges are provided.

Analysing Javascript switch statement use with strings

In this instance, consider a 'userRole' variable that holds a person's role within the application. A switch statement can easily determine the access rights depending upon the value of 'userRole'.

First, create your role variable:
```
let userRole = "Editor";
```

Next, create the switch statement on the 'userRole'. For each case, print out the corresponding user's rights:

switch(userRole) {
  case 'Admin':
    console.log("You have full privileges.");
    break;
  case 'Editor':
    console.log("You can read, add, or edit content.");
    break;
  case 'User':
    console.log("You can read content.");
    break;
  default:
    console.log("Role not recognised. Access denied.");
}

To elaborate: if the user's role is 'Admin', the console logs "You have full privileges.". If it's 'Editor', it logs "You can read, add, or edit content.". If the role is 'User', it will log "You can read content.". For all other cases, the 'default' option will be executed, outputting "Role not recognised. Access denied.".

Switch cases in Javascript are robust and simplified constructs that ultimately reinforce code readability and optimisation. By understanding and harnessing their power, you can create efficient conditions in your programs, even when the situations seem complex with multiple outcomes and possibilities to consider.

Advanced Concepts in Javascript Switch Statement

Diving into the deep end of the JavaScript ocean, you find complex pearls of wisdom like multiple cases in a switch statement and alternatives to switch statements. These advanced concepts allow you to use JavaScript more effectively in your coding projects. So, buckle your seatbelts, you're about to journey into the world of complex coding concepts.

Javascript switch statement multiple cases: a comprehensive overview

With a basic understanding of the robust Javascript switch statement, it's time to unravel new twists in its fabric: handling multiple cases. A Javascript switch statement doesn't buckle under pressure when presented with several cases. Quite the opposite, it thrives, providing numerous pathways for specific outputs, each assigned to distinct cases.

When you have multiple cases in a switch statement, all the cases are checked against the switch expression till a match is found. Once found, the code block associated with the respective case is executed, and the switch block is exited. If there's no match, the default statement executes, if present.

In essence, the JavaScript switch statement takes an input—hopefully a variable—and checks it against several cases using strict equality (i.e., ===). If the input matches a case, the statements under that case execute. If none of the cases match, and there's a default clause, then the statements under the default clause execute.

Multiple case format:

switch(variable) {
  case value1:
    // Block of code
    break;
  case value2:
    // Block of code
    break;
  default:
    // Default block of code
}

Multiple cases extend the scope of your switch statement, allowing you to vary your output based on different conditions. However, they also add an extra layer of complexity to your code, necessitating careful management to avoid errors.

Useful tips for managing multiple case scenarios in switch statements

Handling multiple case scenarios in switch statements requires a delicate balance between preserving code simplicity and implementing intricate control flow structures. Here are a few tips to keep you on the correct path:

Indentation and Formatting: Keep your code clean and easy to read. Indent lines within each case to differentiate them from the case statements.
Ordering Cases: Order matters in certain scenarios where cases need to be checked in a particular sequence. Ensure you order your cases correctly according to your programming needs.
Using Break Statements: Don't forget to use a break after each case. If you forget this, JavaScript will continue to execute the next case's code even if the case does not match.
Default Cases: It's good practice to include a default case in your switch statement to handle scenarios when none of the cases match.

Finding alternatives to switch statement in JavaScript

As versatile as the Javascript switch statement is, there are times when an alternative may be a more suitable solution for the task at hand. Situations where there is a complex condition, dynamic cases or operations other than equality checks may call for an alternative.

Interestingly, the choice between using a switch statement and its alternatives largely depends on the specific requirements of the code. For simpler checks, the if-else construct might be more suitable. For cases involving complex conditions, it could be preferable to use the ternary operator. For object literals, array iteration methods, or lookup tables, different approaches can be more efficient.

If-Else Statement: An if-else statement is commonly used as an alternative to the switch statement. It allows for even more complex condition checking and can increase the readability of your code when there are only small numbers of cases.
Ternary Operator: A ternary operator can be a short and cleaner alternative to switch statements in certain situations.
Object Literals: Object literals are objects containing key-value pairs, where the keys are the cases, and the values are the actions to be taken. They are particularly useful in situations where you need to map keys to values.

Exploring other options when switch statements aren’t enough

While switch statements offer incredible simplicity with multiple conditional checks, they are not without limitations. When dealing with more advanced cases, like those involving complex conditions or a mixture of data types, it's essential to extend your toolbox by exploring other options that might serve you better, such as utilizing the Map object or harnessing loop structures and callback functions.

Map Object: In JavaScript, a Map object is a simple key/value map. With keys quickly retrieved, and a size count maintained automatically, Map objects could be the more efficient and clean option for situations where you need to map keys (your 'cases') to their corresponding functions.
Loop Structures and Callback Functions: Consider using loop structures and callback functions when dealing with dynamic cases where switch statements might be difficult to implement.
Higher-order Functions: In certain scenarios, higher-order functions can provide more flexibility and control than switch statements. Higher-order functions are functions that can manipulate other functions. They can take functions as arguments, return functions, or both.

The key is to master these alternatives and know when to use them, enhancing your problem-solving efficiency in JavaScript programming. Choosing the right tool for the job will lead to cleaner, more efficient code that is easy to understand, maintain and debug.

Common Misconceptions and Troubleshooting Javascript Switch Statement

When treading the waters of Javascript, you might occasionally stumble upon guises and inconsistencies. These are often due to common misconceptions or might be pitfalls waiting to snare the unprepared. Here, we'll demystify some of these misconceptions surrounding the Javascript switch statement and provide reliable troubleshooting strategies for common issues.

Clearing up misconceptions: Javascript switch statement and its functions

Rapid technology updates often lead to uncharted territories, full of potential ambiguities and misconceptions. Misunderstandings about the Javascript switch statement are no exceptions. Unveiling these misconceptions can make the switch statement's functionality crystal clear and save you hours of headaches later.

Your switch statement might not behave as you expect if you misunderstand how it works. Let's clear up some common misconceptions:

Case Sensitivity: Sometimes, you might forget that Javascript is a case-sensitive language. Case sensitivity applies not just to variable names and keywords, but also to string values used in switch cases.
Falling Through Cases: If a break isn't found at the end of a matched case, Javascript doesn't simply stop executing. Instead, it 'falls' to the next case and continues executing – an effect known as 'falling through'.
Default Case: While the default case isn't essential in a switch statement, excluding it could lead to challenges. The default case serves as a safety net, catching all values not accounted for in your cases.
Type Coercion: In Javascript, the switch statement uses strict comparisons (===), not loose comparisons (==). This means that there's no type coercion, and not only the values, but also the types, have to be equal for a match to occur.

Trouble-shooting common issues in Javascript switch statement

Just like any other programming structure, the Javascript switch statement might sometimes lead to unexpected hiccups when things go awry. Identifying the common issues is the first step in solving them. So, let's navigate through the most common issues that you might encounter while working with Javascript switch statements.

Owning the skills to troubleshoot your Javascript switch statement will save you considerable time in debugging, enabling smoother development flow.

Missing Break Statements: If you're noticing that more cases than expected are being executed, it might be because of missing break statements in your cases. Remember, Javascript will continue executing the next case's code if a break is not reached.
Incorrect Ordering of Cases: If you have dependencies between your cases or a certain flow you need to respect, ordering of cases matters.
No Matching Cases: If no case value matches your switch input and you lack a default case, no code block gets executed causing often unexpected behavior in your application.
Nesting: Nesting a switch statement inside another switch statement can lead to confusion and is usually a sign that the code's logic can be simplified.

Addressing common mistakes in switch statement syntax

Occasionally, vexing syntax errors in switch statements can dim your coding light. However, with the proper countermeasures, you can certainly overcome them.

Syntax errors refer to mistakes in the arrangement of words and phrases to create well-formed, readable pieces of code. In switch statements, syntax errors might occur due to incorrect usage of important elements such as 'switch', 'case', 'break' and 'default'.

Mismatched Opening and Closing Braces: Failing to match opening and closing braces is a frequent pitfall. Ensuring you have a pair of braces for each switch and case statement can help mitigate this.
Using Incorrect Case Values: It's important to remember that the values chosen for your cases should match the possible values of the switch expression. An incorrect value often leads to undesired results.
Using Parentheses Inappropriately: The switch expression should be placed inside parentheses, directly after the 'switch' keyword. Failing to enclose or incorrectly enclosing the expression can lead to errors.

By investigating these common syntax mishaps, you can gain mastery in troubleshooting and refining your code while encouraging a more positive learning experience.

Javascript Switch Statement - Key takeaways

Javascript Switch Statement: A unique syntax composed of the 'switch', 'case', 'break', and 'default' statements. The 'switch' statement signifies the start, 'case' contains the value to compare with, 'break' signifies the end of each case and 'default' executes if none of the case values match.

Javascript Switch Statement Syntax:

switch(expression) {
  case value1:
    //Statement
    break;
  case value2:
    //Statement
    break;
  default:
    //Default Statement
}

Javascript Switch Statement Multiple Cases: The Javascript Switch Statement can handle multiple case scenarios, which tests an expression for equality against a list of values. If a 'case' matches the 'switch', the associated block of code is executed.
How to use a switch statement in Javascript: A step by step guide is provided to creating a switch statement, starting by creating a variable to hold your switch expression and proceeding to creating the switch statement and adding in 'case' statements for possible outcomes.

Javascript Switch Statement String Example: Javascript switch statements can also work with strings. The code block demonstrates how to use switch statements to determine different access levels in an application.

switch(userRole) {
  case 'Admin':
    console.log("Full privileges");
    break;
  case 'Editor':
    console.log("Can read, add, or edit content");
    break;
  case 'User':
    console.log("Can read content");
    break;
  default:
    console.log("Access denied");
}

Alternatives to switch statement javascript: If-Else Statement, Ternary Operator, and Object Literals are offered as alternatives to switch statements. The alternatives could be more suitable for complex conditions, dynamic cases or operations other than equality checks.

Frequently Asked Questions about Javascript Switch Statement

The proper syntax for a JavaScript switch statement is: ``` switch(expression) { case x: // code block break; case y: // code block break; default: // code block } ```

Yes, you can use strings in a JavaScript switch statement. The switch statement compares the string value in its expression with the string cases within its block to find a match.

You can implement multiple cases in a Javascript switch statement by having several cases that match different values followed by a colon, with their code block. If a match is found that case is executed, if no match then a default case can be run. For multiple cases with the same code simply add cases sequentially before the code block.

The 'break' keyword in a Javascript Switch Statement is used to exit the switch block. Without it, the code would continue executing the following expressions until it hits a break, or runs out of cases.

Yes, it is possible to have a default case in a Javascript switch statement. The default case is executed when no case matches the switch expression.

Final Javascript Switch Statement Quiz

Javascript Switch Statement Quiz - Teste dein Wissen

Question

What is the Javascript Switch statement?

Show answer

Answer

The Javascript Switch statement is a programming structure that tests a variable for equality against a list of values and executes the block of code associated with the matching case.

Show question

Question

Why are Javascript switch statements used in coding?

Show answer

Answer

Javascript switch statements simplify complex or lengthy 'if...else' conditions and enhance the readability and organization of code by using fewer lines. They save computational power and make code cleaning more efficient.

Show question

Question

What are the main benefits of using the Javascript switch statements?

Show answer

Answer

They enhance the readability and organization of the code, offer a default condition that gets executed when none of the cases match, and promote cleaner coding practices.

Show question

Question

What is the structure of a Javascript switch statement?

Show answer

Answer

The structure of a Javascript switch statement consists of 'switch', 'case', 'break', and optional 'default' statements. It forms a code block with multiple possible execution paths.

Show question

Question

How does the Javascript switch statement handle multiple case scenarios?

Show answer

Answer

The Javascript switch statement can deal with multiple case scenarios by pairing every 'case' with a 'switch'. If the switch matches a case, the associated block of code is executed.

Show question

Question

What is a unique advantage of the Javascript switch statement?

Show answer

Answer

A major advantage of the Javascript switch statement is its capacity to handle multiple conditions with ease. Each case within the statement can have its own conditions to execute, often expressed within parentheses.

Show question

Question

What are the steps to create a switch statement in JavaScript that determines the day of the week?

Show answer

Answer

First, create a variable using a new Date object. Then get the day of the week as a number using getDay(). Create a switch statement using that variable. Inside the switch block, add case statements for each day of the week with a corresponding console.log(), breaking after each statement.

Show question

Question

How can you use a switch statement with strings in JavaScript?

Show answer

Answer

Create a variable to hold the string value. Develop a switch statement using that variable. Include case statements for different string values, each with a corresponding console.log(), and break after each one. Include a default case to catch unrecognised inputs.

Show question

Question

What are the benefits of using switch statements in JavaScript?

Show answer

Answer

Switch statements in JavaScript are simplistic constructs that improve code readability and optimisation. You can create efficient conditions for complex situations with multiple outcomes.

Show question

Question

What is the functionality of a Javascript switch statement with multiple cases?

Show answer

Answer

A Javascript switch statement checks an input variable against multiple cases using strict equality. If a match is found, the respective case statements below are executed. If not, and there's a default clause, the statements under it are executed.

Show question

Question

What are some tips to manage multiple case scenarios in switch statements?

Show answer

Answer

Some tips include: keeping the code clean and readable with line indentations, ordering cases correctly according to needs, using a break after each case to avoid executing the next one, and including a default case for when none of the cases match.

Show question

Question

What are some alternatives to the switch statement in Javascript?

Show answer

Answer

Alternatives include the if-else statement, ternary operator, and object literals. For more advanced cases, other options like Map object, loop structures and callback functions, and higher-order functions can be used.

Show question

Question

What is a common misconception about case sensitivity in Javascript switch statements?

Show answer

Answer

Javascript is a case-sensitive language. Therefore, case sensitivity not only applies to variable names and keywords, but also to string values used in switch cases.

Show question

Question

What issue might occur if you don't include a break in your Javascript switch statement case?

Show answer

Answer

If a break isn't found at the end of a matched case, Javascript doesn't stop executing. Instead, it 'falls' to the next case and continues executing an effect known as 'falling through'.

Show question

Question

What is a common syntax issue that can occur when using a Javascript switch statement?

Show answer

Answer

A common syntax issue is mismatched opening and closing braces. You should ensure you have a pair of braces for each switch and case statement to avoid problems.

Show question

Flashcards in Javascript Switch Statement15

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What is the Javascript Switch statement?

The Javascript Switch statement is a programming structure that tests a variable for equality against a list of values and executes the block of code associated with the matching case.

Why are Javascript switch statements used in coding?

What are the main benefits of using the Javascript switch statements?

They enhance the readability and organization of the code, offer a default condition that gets executed when none of the cases match, and promote cleaner coding practices.

What is the structure of a Javascript switch statement?

The structure of a Javascript switch statement consists of 'switch', 'case', 'break', and optional 'default' statements. It forms a code block with multiple possible execution paths.

How does the Javascript switch statement handle multiple case scenarios?

The Javascript switch statement can deal with multiple case scenarios by pairing every 'case' with a 'switch'. If the switch matches a case, the associated block of code is executed.

What is a unique advantage of the Javascript switch statement?

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Javascript Switch Statement

Introduction to Javascript Switch Statement

Understanding the Javascript switch statement

Why does Javascript have switch statements?

The purposes and benefits of Javascript switch statements

The Structure of Javascript Switch Statement

Breaking down the syntax of Javascript switch statement

Javascript switch statement: dealing with multiple cases

Using switch statements to handle multiple conditions

Practical Javascript Switch Statement Examples

How to use a switch statement in Javascript: step by step guide

Examining a Javascript switch statement string example

Analysing Javascript switch statement use with strings

Advanced Concepts in Javascript Switch Statement

Javascript switch statement multiple cases: a comprehensive overview

Useful tips for managing multiple case scenarios in switch statements

Finding alternatives to switch statement in JavaScript

Exploring other options when switch statements aren’t enough

Common Misconceptions and Troubleshooting Javascript Switch Statement

Clearing up misconceptions: Javascript switch statement and its functions

Trouble-shooting common issues in Javascript switch statement

Addressing common mistakes in switch statement syntax

Javascript Switch Statement - Key takeaways

Frequently Asked Questions about Javascript Switch Statement

Final Javascript Switch Statement Quiz

Javascript Switch Statement Quiz - Teste dein Wissen

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Select your language

Javascript Switch Statement

Introduction to Javascript Switch Statement

Understanding the Javascript switch statement

Why does Javascript have switch statements?

The purposes and benefits of Javascript switch statements

The Structure of Javascript Switch Statement

Breaking down the syntax of Javascript switch statement

Javascript switch statement: dealing with multiple cases

Using switch statements to handle multiple conditions

Practical Javascript Switch Statement Examples

How to use a switch statement in Javascript: step by step guide

Examining a Javascript switch statement string example

Analysing Javascript switch statement use with strings

Advanced Concepts in Javascript Switch Statement

Javascript switch statement multiple cases: a comprehensive overview

Useful tips for managing multiple case scenarios in switch statements

Finding alternatives to switch statement in JavaScript

Exploring other options when switch statements aren’t enough

Common Misconceptions and Troubleshooting Javascript Switch Statement

Clearing up misconceptions: Javascript switch statement and its functions

Trouble-shooting common issues in Javascript switch statement

Addressing common mistakes in switch statement syntax

Javascript Switch Statement - Key takeaways

Frequently Asked Questions about Javascript Switch Statement

What is the proper syntax for a Javascript Switch Statement?

Can I use strings in a Javascript Switch Statement?

How can I implement multiple cases in a Javascript Switch Statement?

What is the use of 'break' in a Javascript Switch Statement?

Is it possible to have a default case in a Javascript Switch Statement?

Final Javascript Switch Statement Quiz

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