Note

Even or odd

puts "Put numbers"
n = gets.to_i

if n.even?
 puts "Is an even number"
else n.odd?
  puts "Is odd"
end

to_i　to_s

The to_i method is character → numeric
The to_s method is a number → character

gets is saved as a string. To convert to a number → gets.to_i

each_with_index

fruits=["Apple","melon","Strawberry"]

fruits.each_with_index do |fruit, i|
puts “#{i+1}The second element is#{fruit}is. ”
end
【result】
The first element is the apple.
The second element is the melon.
The third element is strawberries.

Change branches while inheriting uncommitted changes

http://vatscy.github.io/blog/2014/03/30/git-branch-stash/