Javascript
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JavaScript is a synchronous, single threaded programming language
it's run top to bottom

Synchronous
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Synchronous is a blocking architecture, so the execution of each operation depends on completing the one before it

Asynchronous
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Asynchronous is a non-blocking architecture, so the execution of one task isn't dependent on another. Tasks can run simultaneously.

data types
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Primitive Types
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is have is not an object and has no methods or properties
string, number, boolean, null, undefined

The Object Datatype
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array, object, date

Scope
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Block Scope
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Variables declared with the let keyword inside a { } block cannot be accessed from outside the block
Variables declared with the var keyword can NOT have block scope

Function Scope
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Each function creates a new scope
var, let and const
same name can be declare inside the different function

Global Scope
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A variable declared outside

Built-in objects
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number, string, math, date, error

Type Casting
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Type conversion means the transfer of data from one data type to another
Explicit Type and Implicit Type Casting