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PHP, for all its warts, is pretty good on this count. There's no difference between an array and a hash (maybe I'm naive, but this seems obviously right to me), and to iterate through either you just do
foreach (array/hash as $key => $value) In Ruby there are a bunch of ways to do this sort of thing:
array.length.times do |i| end array.each array.each_index for i in array Hashes make more sense, since I just always use
hash.each do |key, value| Why can't I do this for arrays? If I want to remember just one method, I guess I can use each_index (since it makes both the index and value available), but it's annoying to have to do array[index] instead of just value.
Oh right, I forgot about array.each_with_index. However, this one sucks because it goes |value, key| and hash.each goes |key, value|! Is this not insane?
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The Ruby Enumerable#each method is the most simplistic and popular way to iterate individual items in an array. It accepts two arguments: the first being an enumerable list, and the second being a block. It takes each element in the provided list and executes the block, taking the current item as a parameter.
“Iterators” is the object-oriented concept in Ruby. In more simple words, iterators are the methods which are supported by collections(Arrays, Hashes etc.). Collections are the objects which store a group of data members. Ruby iterators return all the elements of a collection one after another.
Ruby arrays can hold objects such as String, Integer, Fixnum, Hash, Symbol, even other Array objects. Ruby arrays are not as rigid as arrays in other languages. Ruby arrays grow automatically while adding elements to them.
This will iterate through all the elements:
array = [1, 2, 3, 4, 5, 6] array.each { |x| puts x } # Output: 1 2 3 4 5 6 This will iterate through all the elements giving you the value and the index:
array = ["A", "B", "C"] array.each_with_index {|val, index| puts "#{val} => #{index}" } # Output: A => 0 B => 1 C => 2 I'm not quite sure from your question which one you are looking for.
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