Lets say I have this:
a = [1, 2, 3, 4, 5]
b = ['a', 'b', 'c', 'd', 'e']
c = ['ABC', 'DEF', 'GHI', 'JKL', 'MNO']
And I want this:
d = [[1, 'a', 'ABC'], [2, 'b', 'DEF'], ...]
How can I accomplish this in Ruby?
I tried with .zip
r = []
r.zip(a, b, c)
puts r
But didn't work.
You need to do as below :-
a = [1, 2, 3, 4, 5]
b = ['a', 'b', 'c', 'd', 'e']
c = ['ABC', 'DEF', 'GHI', 'JKL', 'MNO']
a.zip(b,c)
# => [[1, "a", "ABC"], [2, "b", "DEF"], [3, "c", "GHI"], [4, "d", "JKL"], [5, "e", "MNO"]]
One thing to remember here - Array#zip returns an array of size, equal to the size of the receiver array object.
# returns an array of size 2, as the same as receiver array size.
[1,2].zip([1,5,7]) # => [[1, 1], [2, 5]]
# below returns empty array, as the receiver array object is also empty.
[].zip([1,2,3,4,5]) # => []
For the same reason as I explained above r.zip(a, b, c) returns [].
[a, b, c] — you can use transpose on the outer array to get the same effect.
zip silently adds nil.[a,b,c].reduce(:zip).map(&:flatten)
