let message;
message = 'Hello!';

alert(message);

alert( 1 / 0 ); // Infinity

alert( Infinity ); // Infinity

let name = "John";

// embed a variable
alert( `Hello, ${name}!` ); // Hello, John!

// embed an expression
alert( `the result is ${1 + 2}` ); // the result is 3