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<meta name="description" content="[Description and examples of variables.]">
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  <title>Variables, Constants, and Lets</title>
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<script id="jsbin-javascript">
/*

Variables, Constants, and Lets

Variables, constants, and lets hold values in memory so
that they can be used elsewhere in applications. The value
and data type of variables can be changed. As well, they
can be local or global. On the contrary, constants may not
change once they are assigned, although they are restricted
to the code block in which they are assigned and declared.
Lets are similar to variables and constants. They may change
value, but they are limited to the scope in which they are
declared and assigned.

Variables are declared with the keyword var:
*/
var firstName;
var favNumber;
/*
At this point, the variable is undefined because it has not
been initialized/assigned.

Best practice is to both declare and assign a variable
at the same time:
*/
var firstName = "Daniela";
var favNumber = 7;
/*
Variables may be simple values like numbers, strings, and
booleans, as well as arrays or objects.

Constants may also be simple values, as well as arrays or objects.
As simple values, they may never change within their scopt.
Arrays or objects that are constants may be modified, but not reassigned.
Lets may be reassigned within scope, but may not be global variables.

*/
</script>


<script id="jsbin-source-javascript" type="text/javascript">/*

Variables, Constants, and Lets

Variables, constants, and lets hold values in memory so
that they can be used elsewhere in applications. The value
and data type of variables can be changed. As well, they
can be local or global. On the contrary, constants may not
change once they are assigned, although they are restricted
to the code block in which they are assigned and declared.
Lets are similar to variables and constants. They may change
value, but they are limited to the scope in which they are
declared and assigned.

Variables are declared with the keyword var:
*/
var firstName;
var favNumber;
/*
At this point, the variable is undefined because it has not
been initialized/assigned.

Best practice is to both declare and assign a variable
at the same time:
*/
var firstName = "Daniela";
var favNumber = 7;
/*
Variables may be simple values like numbers, strings, and
booleans, as well as arrays or objects.

Constants may also be simple values, as well as arrays or objects.
As simple values, they may never change within their scopt.
Arrays or objects that are constants may be modified, but not reassigned.
Lets may be reassigned within scope, but may not be global variables.

*/
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