var firstName = "David";
var lastName = "Pine";
var dateOfBirth = new Date(1984, 7, 7);

// C# 7.0, required "explicit names"
var person = (firstName: firstName, lastName: lastName, dateOfBirth: dateOfBirth);
person.firstName;   // "David"
person.lastName;    // "Pine"
person.dateOfBirth  // 7/7/1984

// C# 7.1, allows "inferred names"
person = (firstName, lastName, dateOfBirth);
person.firstName;   // "David"
person.lastName;    // "Pine"
person.dateOfBirth  // 7/7/1984