• 0 is logical true.
• all parts of logical expression with | and & are evaluated.

guessnumber.rb: game where player have to guess a number from 1 to 10.

• yeld in caller calls the code block.

• fourperline.rb: print content of an array of sixteen numbers, four numbers at a time, using just each. Than do the same with each_slice in Enumerable.
• hashtotree.rb: a Tree class with initializer accepting nested structure with hashes and arrays like this: { 'grandpa' => { 'dad' => { 'child 1' => {}, 'child 2' => {} }, 'uncle' => { 'child 3' => {}, 'child 4' => {} } } }.
• simplegrep.rb: a simple grep that prints lines of file containing a phrase in that line using a regex match, include line numbers. Example of usage: ./simplegrep.rb loremipsum.txt "int[a-z]ger"

• n/a

• csvrow.rb: modified csv sample application to support an each method to return CsvRow object using methon_missing at CsvRow to return the value for column for a given heading.

(eof)