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@demonixis
Last active November 8, 2021 15:26
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A basic Person class in JavaScript
/***********************************
* First method to create a classe *
* *********************************/
var Person = function (firstname, lastname, age) {
this.firstName = firstname;
this.lastName = lastname;
this.age = age;
this.setAge = function (age) {
this.age = age;
};
this.toString = function () {
return ["Hi ! I'm ", this.firstName, " ", this.lastName, " and I'm ", this.age, " year old."].join("");
};
};
var yann = new Person("Yannick", "Comte", 28);
console.log(yann.toString());
/************************************
* Second method to create a classe *
* **********************************/
var Person = function (firstname, lastname, age) {
this.firstName = firstname;
this.lastName = lastname;
this.age = age;
};
// Prototypes are better for performances if you have many call of this method
Person.prototype.setAge = function (age) {
this.age = age;
};
Person.prototype.toString = function () {
return ["Hi ! I'm ", this.firstName, " ", this.lastName, " and I'm ", this.age, " year old."].join("");
};
var yann = new Person("Yannick", "Comte", 28);
console.log(yann.toString());
/***********************************
* Inheritance *
* *********************************/
var Developer = function (firstname, lastname, age, skills) {
Person.call(this, firstname, lastname, age);
this.skills = skills;
};
Developer.prototype.setAge = function (age) {
Person.prototype.setAge.call(this, age); // Super(age)
}
Developer.prototype.toString = function () {
return ["Hi ! I'm ", this.firstName, " ", this.lastName, " and I'm ", this.age, " year old and I'm a developer with a skill level of ", this.skills].join("");
};
/*******************************************
* Private attributes and functions *
* *****************************************/
var Person = function (firstname, lastname, age) {
// Private because of var keyword
var _firstName = firstname;
var _lastName = lastname;
var _age = age;
// Public because of this keyword
this.setAge = function (age) {
_age = age;
};
this.getAge = function () {
return _age;
};
var getToStringValue = function () {
return ["Hi ! I'm ", _firstName, " ", _lastName, " and I'm ", _age, " year old."].join("");
};
this.toString = function () {
return getToStringValue();
};
};
var yann = new Person("Yannick", "Comte", 0);
yann.setAge(28);
yann._age = 45; // Add a property "_age" to the object, not changing the private "_age" variable !
yann.getToStringValue(); // Doesn't work because it's private !
yann.toString(); // It's good because it's public ;)
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