Summary  
This chapter covers chaining `if`, `else if`, and `else` clauses in conditional statements to evaluate multiple boolean expressions in sequence so that only the first matching block executes.

General domain of usage  
Numeric range–based branching

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:

```js
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:
```js
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:

What is the purpose of the `else if` clause in an if-else statement?

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The `else if` Clause

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The `else if` Clause