Objects
Like arrays objects can store multiple bits of information, except objects store the properties of something. For example, you might want to save the name, model and colour of a car. Or the name, time and location of a film playing at the cinema.
There are several ways to write objects. Object literals (literal notation) look like this:
{
property1: "value1",
property2: "value2",
property3: "value3"
}
The names on the left ("property1") are known "keys". Any values can be given to them: strings, booleans, integers.
Try it out
Let's define an object that represents a person:
var person = {
firstName: "Nelson",
lastName: "Mandela",
occupation: "freedom fighter",
age: 95,
alive: false
};
We can console.log() the entire object, but you can also reference just one of the properties. Run this code:
console.log(person.firstName);
Exercise Using an object representing a person,
console.log()a sentence introducing the person. Print out the following:"Hi, my name is {firstName} {lastName}. I am {age} years old, and work as a {occupation}."
Hint: you can construct longer strings by adding them together. This includes variables. For example:
var name = "Jane"; console.log("People call me " + name); // the previous line will print // "People call me Jane"
Object Constructors
We can also use the object constructor syntax to make a new object. It looks like this:
```js function Book(name, year) { this.name = name; this.year = '(' + year + ')'; }