Impara The `else if` Clause

In addition to the else clause, conditional statements support an else if clause, which can be used to define alternative conditions if the initial if condition is false.

The general syntax is as follows:

if(expression) {
  // Code … (executed if the expression is true)
} else if(expression) {
  // Fallback Code … 
  //(executed if the previous condition is false, and this one is true)
}

As seen in the general syntax, the else if clause takes a boolean expression, which is evaluated when the condition before it turns out to be false.

We can chain multiple else if clauses to form an if-else if chain:

if(expression) {
  // … (executed if the first condition is true)
} else if(expression) {
  // … (executed if the first condition is false and this is true)
} else if(expression) {
  // … (executed if previous conditions are false and this is true)
} else {
  // … (executed if all previous conditions are false)
}

As shown in the code above, we can optionally add the else clause at the end. This block is executed only when all the previous conditions evaluate to false.

The following example demonstrates the usage of this syntax:


              123456789
            
let number = 50;

if (number < 20) {
  console.log("The number is less than 20.");
} else if (number === 20) {
  console.log("The number is exactly 20.");
} else {
  console.log("The number is greater than 20.");
}

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Sezione 1. Capitolo 39

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