Difference Between Switch And If Else In JavaScript

Difference Between Switch And If Else In JavaScript | If you’re new to JavaScript and programming, you might be unsure which conditional statements to employ, precisely the difference between if-else and switch-case expressions. In JavaScript, conditional statements enable us to make judgments based on a condition. We can do one action if the condition is true; otherwise, we can take a different action.

As a result, we may use if-else and switch-case to make these judgments based on a condition. In most cases, a switch statement is more efficient than a series of nested ifs. When deciding which one to use, consider readability as well as the expression that the expression is verifying.

An if-else statement is used to make judgments, whereas a switch statement verifies the value. Selection statements include “if-else” and “switch.” The selection instructions direct the program’s flow to a specific block of statements based on whether the conditions are “true” or “false.”

If-else and switch statements are fundamentally different in that the if-else statement “selects the execution of the statements based on the assessment of the expression in if statements.” “Selects the implementation of the statement frequently according to a key command,” as per the switch statement.

Syntax Difference Between Switch and If Else in JavaScript

The syntax for the if-else statement in JavaScript:-

if (condition1) { 
   // body of if 
} else if (condition2) { 
   // body of if 
} else if (condition3) {
   // body of if 
} else {
   // default if all conditions return false 
}

The syntax for switch case in JavaScript:-

switch ( variable ) {
   case <variable value1>: 
      // do Something
      break;

   case <variable value2>:
      // do Something
      break;

   default:
      // default will perform if all case’s fail
      break;
}

Difference Between Switch and If Else in JavaScript Language

1. Basic: The expression inside an if statement determines whether the sentences in the if block or the else block are executed. The expression inside the switch statement determines which case should be executed (which is also decided by the user).

2. Testing: The if-else statement examines both equality and logical expression. Switch, on the other hand, just looks for equality.

3. Evaluation: The if statement evaluates types such as integer, character, pointer, floating-point, and boolean. The switch statement, on the other hand, evaluates only character or numeric data types.

4. Execution sequence: The statement under the if block will execute first, followed by the statements beneath the otherwise block statement. However, if you do not use a break statement after each case, the phrase in the switch statement determines which case to execute by the end of the switch expression.

5. Default execution:  If the phrase inside the if turns out to be false in an if-else statement, the statement inside the else block will be run. If the expression within the switch statement proves to be untrue, the default code is executed.

6. Editing: It’s well known that editing if-else statements are tough since tracing where the fix is needed is arduous. Because switch statements are straightforward to trace, many people agree that editing them is significantly easier.

Some important benefits of switching over the if-else ladder include:

A switch statement is significantly faster than an if-else ladder. It’s because, during compilation, the compiler creates a jump table for a switch. As a result, rather than verifying which case is fulfilled throughout execution, it just decides which case must be completed. It’s easier to read than if-else expressions.

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