JavaScript Methods and Custom Constructors

• Like a function but used specifically with objects
• Defined like a function but you add the name after the object
• bob.setAge = function (newAge)
• Functions require parameters while methods do not
• "this" can refer to a specific object without having to write it in the method
• var setAge = function (newAge) {
    this.age = newAge;
  };

• Custom constructors work like this
• function Person(name,age) {
    this.name = name;
    this.age = age;
  }
• and can be called like this
• var bob = new Person("Bob Smith", 30);
• You can also have it so that there will be a value for all objects when making a custom constructor
• function Person(name,age) {
    this.name = name;
    this.age = age;
    this.species = "Homo Sapiens";
  }
• There is no parameter for species so Person will always be Homo Sapien
•  They can also come with methods
• function Rectangle(height, width) {
    this.height = height;
    this.width = width;
    this.calcArea = function() {
        return this.height * this.width;
    };
    this.calcPerimeter = function() {
        return this.height * 2 + this.width * 2
    }
  }