Generate Key Map Object Javascript

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Create an empty div element above the script element and give it an id of 'map'. This is where your map will be displayed. Create a script element in the head of your page and put function called initMap inside it. Create a mapOptions object and set values for the properties you want to modify. Dec 12, 2019  Introduction. From the classic forloop to the forEach method, there are various techniques and methods used to iterate through datasets in JavaScript. One of the most popular methods is the.map method.map creates an array from calling a specific function on each item in the parent array.map is a non-mutating method in that it creates a new array as opposed to mutating.

Real Life Objects, Properties, and Methods

In real life, a car is an object.

A car has properties like weight and color, and methods like start and stop:

Object	Properties	Methods
car.name = Fiat car.model = 500 car.weight = 850kg car.color = white	car.start() car.drive() car.brake() car.stop()

All cars have the same properties, but the property values differ from car to car.

All cars have the same methods, but the methods are performed at different times.

JavaScript Objects

You have already learned that JavaScript variables are containers for data values.

This code assigns a simple value (Fiat) to a variable named car:

Objects are variables too. But objects can contain many values.

This code assigns many values (Fiat, 500, white) to a variable named car:

var car = {type:'Fiat', model:'500', color:'white'};

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The values are written as name:value pairs (name and value separated by a colon).

JavaScript objects are containers for named values called properties or methods.

Object Definition

You define (and create) a JavaScript object with an object literal:

Example

Generate Key Map Object Javascript Pdf

var person = {firstName:'John', lastName:'Doe', age:50, eyeColor:'blue'};

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Spaces and line breaks are not important. An object definition can span multiple lines:

Example

var person = {
firstName: 'John',
lastName: 'Doe',
age: 50,
eyeColor: 'blue'
};

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Object Properties

The name:values pairs in JavaScript objects are called properties:

Property	Property Value
firstName	John
lastName	Doe
age	50
eyeColor	blue

Accessing Object Properties

You can access object properties in two ways: Rhino 4.0 cd key generator v1 2.

or

Example1

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Example2

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Object Methods

Objects can also have methods.

Methods are actions that can be performed on objects.

Methods are stored in properties as function definitions.

Property	Property Value
firstName	John
lastName	Doe
age	50
eyeColor	blue
fullName	function() {return this.firstName + ' ' + this.lastName;}

A method is a function stored as a property.

Example

var person = {
firstName: 'John',
lastName : 'Doe',
id : 5566,
fullName : function() {
return this.firstName + ' ' + this.lastName;
}
};

The this Keyword

In a function definition, this refers to the 'owner' of the function.

In the example above, this is the person object that 'owns' the fullName function.

In other words, this.firstName means the firstName property of this object.

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Read more about the this keyword at JS this Keyword.

Accessing Object Methods

You access an object method with the following syntax:

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Example

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If you access a method without the () parentheses, it will return the function definition:

Example

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Do Not Declare Strings, Numbers, and Booleans as Objects!

When a JavaScript variable is declared with the keyword 'new', the variable is created as an object:

var x = new String(); // Declares x as a String object
var y = new Number(); // Declares y as a Number object
var z = new Boolean(); // Declares z as a Boolean object

Avoid String, Number, and Boolean objects. They complicate your code and slow down execution speed.

You will learn more about objects later in this tutorial.