HW W1D4 - VariablesHW W1D4// source http://jsbin.com/qicites

jsbin.qicites.js

/*
* VARIABLES:
*
* 0. To hold things in memory during the life-cycle of a program, we can use variables.  Variables 
* are named identifiers that can point to values of a particular type, like a Number, String, 
* Boolean, Array, Object or another data-type.  Variables are called so because once created, we 
* can CHANGE the value (and type of value) to which they point.
*
* 1. To create a variable we use the keyword, var, followed by a name (id or alias) for our 
* variable.
*
* 2. There are 2 phases of using variables: declaration and initialization (or assignment).
*/

// 1. declaration //
var myName; 

/*
* At the declaration phase, the variable myName is undefined because we have NOT initialized 
* it to anything 
*/ 
console.log(myName); // prints => undefined

// 2. initialization or assignment //
myName = 'Maxwell';
console.log(myName); // prints => john

// 3. re-assignment //
myName = 'Jordan';
console.log(myName); // prints => bob

// NOTE: We can assign and re-assign anything to a variable - we cannot do this with constants //
var myVariable = 1;
var myVariable = true;
myVariable = "someString";