🟨JavaScript data types (primitives)

the building blocks of web apps

We can categorize basic forms of data, known as primitives, as follows:

Name	Purpose	Example
Number	a value we can calculate with another	an integer like 3, -1 or 0 a floating point number like -273.15
String	a value with one or more alphanumeric characters	plain text like String or Hello world! plain text that has non-calculatable numbers like Price: $200
Boolean	a value that is either true or false	true false
null	a placeholder value	(null implies that some value should exist)
undefined	a value signifying the lack of a value	(undefined implies that no value exists)
Object	a value with a structure that consists of a set of properties, each with a name and value	{ username : "Jon", age: 100, alive : true }

Contrary to what the browser console might say, null is not an Object but its own primitive type (this is a long-standing bug in JavaScript!)