Wednesday, October 14, 2009

Ruby on Rails : For / While / Do While / Switch

MethodExample CodeOutput
For Loop
<% for i in 0..9 %>
Result: <%= i %>,
<% end %>
Result: 0,1,2,3,4,5,6,7,8,9
<% @people = Person.find(:all) %>
<% for i in 0...@person.length %>
Result: <%= @person[i].name %>,
<% end %>
Result: John,Peter,Sharon
<% @people = Person.find(:all) %>
<% for person in @people %>
Result: <%= @person.name %>,
<% end %>
Result: John,Peter,Sharon
While Loop
<% i = 0 %>
<% while( i < 10 ) %>
Result: <%= i %>,
<% i+= 1 %>
<% end %>
Result: 0,1,2,3,4,5,6,7,8,9
Do While Loop
<% i = 5 %>
<% begin %>
Result: <%= i %>,
<% i+= 1 %>
<% end while( i < 10 ) %>
Result: 5,6,7,8,9
Switch Statement
<% foo = 5 %>
<% case foo %>
<% when 1 %>
   Foo is equal to 1
<% when 2..9 %>
   Foo is between 2 and 9
<% when 10 %>
   Foo is equal to 10
<% end %>
Foo is between 2 and 9

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