JS BinVariables, Const, Let// source https://jsbin.com/hoqace

jsbin.hoqace.js

/*
* Variables:
*
*Variables are continers used to hold values. Thes values can be any
*data type. Variables can be changed once they are defined.
*
* To create a variable we use the keyword var followed by the name  . 
*/ 
var firstName;
console.log(firstName);
/* In the above example the variable firstName was declared. At this point
* if firstName was to be called it's value would be undefined. A value for
* firstName has not been set
*/
firstName = "Harley";
console.log(firstName);
/* Now firstName has been initialized. We have given it the value "Harley"
*Now if firstName is called it will return a value of "Harley"
* Variables can be reassigned using the same form as the above example.
*Reassigning a variable changes the value stored inside of it.
*/
firstName = "Christian";
console.log(firstName);
/* The value of firstName is now "Christian" since it has been reassigned.
*When reassigned a varible in Javascript you do not have to keep it the same datatype.
*
*Conts:
*Conts are constant. They can not be reassigned.
*/
//Const hisName = "Lloyd"; //
//hisName = "Quentin";//
/* When consoled "Lloyd" would still be the value for hisName.
*
*Let:
*Let is blocked scoped. It can be reassigned.
*/