Introduces interpolation and the use of having expressions inside string literals
Substitions of characters in strings and introduction to regular expressions
More work with reg exps and introducing modifiers
Finishes with regular expressions. Character classes described and ranges
Shows how to use new operator and method for matching strings using reg exps
Creates a simple first ruby program that check if the user has enter a date with the correct format yyyy-mm-dd
Improves the date validation. The day is still not enough validated. Needs better regex or array knowledge
Shows how to define an array, push elements into it, pop them out, join them and how to split string into an arrays
Shows the Ruby way of iterating through arrays and shows the collect/map method
Shows addition, subtraction and concatination of elements in separate arrays
Checks if array is empty or if it contains certain element
Presents the first, last and reverse method used for array workarounds