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Start at both ends
Methods are actions that can be performed on objects. Methods are functions stored as property values.
const person
= {
firstName: "John", lastName: "Doe", age: 50, fullName: function() {
return this.firstName + " " +
this.lastName;
}
};50 fullName function()
{
return this.firstName + " " + this.lastName;
}In an object method, this refers to the object.
Example 1 const person = {
firstName: "John", lastName: "Doe", id: 5566, getId: function() {
return this.id;
}
};
let number = person.getId();In the example above, this refers to the person object. this.id means the id property of the person object.
= {
firstName: "John", lastName: "Doe", age: 50, fullName: function() {
return this.firstName + " " +
this.lastName;
}
};In the example above, this refers to the person object. this.firstName means the firstName property of the person object. this.lastName means the lastName property of the person object.
To call an object method, add parentheses ()
Without parentheses you get the function itself. Syntax objectName.methodName () If you call a method with parentheses, it will execute as a function
Example name = person.fullName();If you call a method without parentheses, it will return the function definition
Example name = person.fullName;You can add a method to an object by assigning a function to a property
// Assign person.name to a function person.name = function () {
return this.firstName + " " + this.lastName;
};In the example above, person.name is a property with a function assigned to it.
method to convert a text to uppercase:
Example person.name = function () {
return (this.firstName + " " + this.lastName).toUpperCase();
};person.fullName() In methods, this refers to the object You can add methods to objects by assigning a function to a property