Nested if else in Javascript

Nested if..else statements are the ones in which one conditional statement (if statement or if..else statement) is nested inside another conditional statement (if statement or if..else statement).

Example:

var x = 10;

if (x === 0) {
    console.log("Neither positive nor negative!");
} else if (x > 0) {
    if (x < 10) {
        console.log("Single-digit positive number!");
    } else {
        console.log("More than one-digit positive number!");
    }
} else {
    console.log("Negative number!");
}

Output:

"More than one-digit positive number!"

Here, an if..else block is nested inside another else..if block in a if..else..if chain. This is an example of nested if..else statements.