I've got an array that at this point is ["firstname1 ", "lastname1", "firstname2 ", "lastname2", etc], and I'm trying to come up with a way to combine the strings such that I'll have an array of ["firstname1 lastname1", "firstname2 lastname2", etc].
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2 Answers
Using Enumerable#each_slice, you can iterate slice of n elements (2 in your case).
By joining those two elements, you will get what you want.
a = ["firstname1 ", "lastname1", "firstname2 ", "lastname2"]
a.each_slice(2).map(&:join)
# => ["firstname1 lastname1", "firstname2 lastname2"]
Comments
Some other ways:
a = ["Shirley ", "Temple", "Oliver ", "Hardy", "John ", "Wayne"]
#1
(0...a.size).step(2).map { |i| a[i]+a[i+1] }
#=> ["Shirley Temple", "Oliver Hardy", "John Wayne"]
#2
enum = a.to_enum
(a.size/2).times.map { enum.next + enum.next }
#=> ["Shirley Temple", "Oliver Hardy", "John Wayne"]
#2a
enum = a.to_enum
names = []
loop { names << enum.next + enum.next }
names
#=> ["Shirley Temple", "Oliver Hardy", "John Wayne"]
#3
fname = nil
a.each_with_object([]) { |s,a| (s[-1]==' ') ? fname=s : a << fname+s }
#=> ["Shirley Temple", "Stan Laurel", "John Wayne"]
