Douglas Crockford showed a slide showing how he creates JavaScript objects in 2014.
He no longer uses Object.create(), avoids 'this' and doesn't even care about memory reduction by using prototypes.
https://www.youtube.com/watch?v=bo36MrBfTk4 (skip ahead to 35 mins for relevant section)
Here is the pattern described on the slide:
function constructor(spec) {
var that = otherConstructor(spec),
member,
method = function () {
// spec, member, method
};
that.method = method;
return that;
}
Here is my interpretation of this pattern:
function Person(spec) {
var person = spec;
// methods
person.getDisplayName = getDisplayName;
return person;
function getDisplayName() {
return person.firstName + " " + person.lastName;
}
}
function Employee(spec) {
var employee = Person(spec);
// members
employee.employeeId = spec.employeeId;
employee.hourlyRate = spec.hourlyRate;
// methods
employee.calculatePay = calculatePay;
return employee;
// implementations
function calculatePay(hoursWorked) {
return employee.hourlyRate * hoursWorked;
}
}
var ben = Employee({
firstName: 'Ben',
lastName: 'Priebe',
hourlyRate: 120,
employeeId: 1
});
console.log(ben.getDisplayName());
console.log(ben.calculatePay(38));
Note to self: Set an object literal as a default spec argument.