Basic Data Structures
Before we can write this program, we will need to go over a few new language features.
called properties. Every string, for example, has a property called
length, which refers to an integer, the amount of characters in that
Properties can be accessed in two ways, either with brackets or using dot notation:
var text = "purple haze";
The second way is a shorthand for the first, and it works only when the name of the property is a valid variable name—when it doesn’t have any spaces or symbols in it and does not start with a digit character.
Trying to read a property from the values
null and ...