JavaScript Data types Bible

Data types are values that don’t have properties. Below are the latest ECMAScript standard JS data types.

1. Numbers (1, 1.2, 2, 3.4 NaN)
2. Strings = “Timmy” or ‘Please feed dog’ , backticks `${interpolate} `

• backticks interpolated with $ = called Template literals
• inside the brackets = include variables, other primitives that can be converted into a string
• strings are quoted because if can mean something very special to JS or it can be a reserved word (“if you can keep cooking”)

3. Null (null — empty, kinda like `nil`)

4. Boolean (true, false)

5. Undefined = weird empty placeholder

6. Object = { } , [ ], function() { }

• use . and then state’s name
• trigger behavior by using behavior’s name followed by a ()
• . is a separator bw the object-name and the state or behavior name
• behaviors on objects are called methods
• object’s methods have access to all of that object’s properties
• methods can take arguments
• arguments change the method’s operation
• Poodle.eat(1); //=> “Timmy eats 1 can of food”
• methods can take many arguments just separate them each with its own ‘ ‘ and comma,
• document = important object when working with DOM

7. Symbol — new Symbol(“name”)