conditional javascript that take the first false as positive code example

Example 1: javascript if else

var age=20;
if (age < 18) {
	console.log("underage");
} else {
	console.log("let em in!");
}

Example 2: else if

if ( x > 10 )
{
cout << "x is greater than 10";
}
else
{
cout << "x is less than 10";
}