Module: Enumerable

Defined in:
lib/fat_core/enumerable.rb

Instance Method Summary collapse

Instance Method Details

#each_with_flags ⇒ Object

Yield each item together with two booleans that indicate whether the item is the first or last item in the Enumerable.

('a'..'z').to_a.each with_flags do |letter, first, last| if first # do something special for the first item elsif last # do something special for the last item else # a middling item end end



26
27
28
29
30
31
32
33
 
# File 'lib/fat_core/enumerable.rb', line 26

def each_with_flags
  last_k = size - 1
  each_with_index do |v, k|
    first = (k == 0 ? true : false)
    last  = (k == last_k ? true : false)
    yield(v, first, last)
  end
end

#groups_of(n) ⇒ Object

Yield items in groups of n, for each group yield the group number, starting with zero and an Array of n items, or all remaining items if less than n.

('a'..'z').to_a.groups_of(5) do |k, grp| # On each iteration, grp is an Array of the next 5 items except the # last group, which contains only ['z']. end



9
10
11
12
 
# File 'lib/fat_core/enumerable.rb', line 9

def groups_of(n)
  k = -1
  group_by { k += 1; k.div(n) }
end