First off I must note how nice it is that semicolons, and several other punctuation items, are optional.
Another nice thing I have been introduced to is the iterator. In most cases it completely replaces the old for loop.
var.each {|x| ….}
or
for x in var {……}
seem much cleaner and easier to write than
for (int i=0; i<10; i++) {…; …;}
Extending this makes it handy to work with multiple parameters. Let’s say that you want to pass in a variable number of arguments, that can also be hashes.
One way of working with them in the method would be as follows:
class Ema
…
def initialize(p1, p2, *p3) # the ‘*’ will push arguments 3…n into p3 as an array
…
# then you might access parameter3 with one of the following .each variants:
def showMe
@p3.each do |s| #this gives you each element of the array -
puts “ p3: s = #{s}”
s.each_key do |y| #each element is a hash, so this gives you the keys
puts ” #{y} = #{s[y]}”
end
s.each do |y,z| #this will give you the key, value pairs
puts ” #{y} = #{z}”
end
s.each do |r| #and this gives you the key,value in an array
puts ” #{r[0]} = #{r[1]}”
end
end
end
a = Ema.new(“one”, “two”, {“apple” => 3}, {“pear” => 1}, {“grape” => 5}, {“kiwi” => 33})
a.showMe
