SDI - Project 4 Started: Prepared all of the files to begging coding Project 4.
Added a "String Function" to validate the formatting of a 10 digits phone number, with its dashes in the appropriate place.
Added the first Math Function:

Format a number to use a specific number of decimal places as for money: 2.1 --> 2.10.
Added the fourth Math Function:

Given a string version of a number, such as "42", return the value as an actual Number data type, such as 42.
Added the second Array Function:

Find the total value of just the numbers in an array, even if some of the items are not numbers.
Added the second String Function:

Does a string follow an email address pattern?
Added the third String Function:

Is the string a URL?