Nuby question re a method

ruby-talk
1

I am new to ruby, and have a simple question.

In the tutorial, I came across

class AddressBook
def each
@persons.each { |p| yield p }
end
end

defining the method each on the Class AddressBook (an array of hashes;
the addressbook is an array of persons, each person is a hash;
his name, address, etc.)

Question 1.
Is this the same as the following?

class AddressBook
def each
@persons.each
do |p|
yield p
end
end
end

Question 2. Is my terminology correct? If not, is the meaning
clear enough?

Van

2

class AddressBook
def each
@persons.each { |p| yield p }
end
end

defining the method each on the Class AddressBook (an array of hashes;
the addressbook is an array of persons, each person is a hash;
his name, address, etc.)

Actually, an instance of the AddressBook class contains an array of persons
(in the @persons instance variable); it is not actually an array (it could be,
if it was declared “class AddressBook < Array”, and used “self” instead of
“@persons”).

Question 1.
Is this the same as the following?

class AddressBook
def each
@persons.each
do |p|
yield p
end
end
end

Almost. It’s true that {…} and do…end are synonyms (although
they differ in precedence). But do, like {, has to be on the same
line as the method call; @persons.each on a line by itself is a syntax error.

Question 2. Is my terminology correct? If not, is the meaning
clear enough?

Your terminology is fine!

-Mark

···

On Tue, Dec 09, 2003 at 06:47:38PM -0800, Van Jacques wrote: