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They seem to do the same thing.
g = [{ a: "A" }, { b: "B" }]
r = [{ x: "X" }, { y: "Y" }]
g.zip(r) # => [[{:a=>"A"}, {:x=>"X"}], [{:b=>"B"}, {:y=>"Y"}]]
[g,r].transpose # => [[{:a=>"A"}, {:x=>"X"}], [{:b=>"B"}, {:y=>"Y"}]]
Why have both methods?
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Ruby | Array zip() function Array#zip() : zip() is a Array class method which Converts any arguments to arrays, then merges elements of self with corresponding elements from each argument. Return: merges elements of self with corresponding elements from each argument.
Ruby | Array transpose() function Array#transpose() : transpose() is a Array class method which returns the length of elements in the array transposes the rows and columns.
Elements in an array can be retrieved using the #[] method. It can take a single integer argument (a numeric index), a pair of arguments (start and length) or a range. Negative indices start counting from the end, with -1 being the last element. The slice method works in an identical manner to #[].
#transpose Assumes that self is an array of arrays and transposes the rows and columns.
#zip assumes self can be any Enumerable object.
More differences are here
a = [12,11,21]
b = [1,2]
[a,b].transpose # transpose': element size differs (2 should be 3) (IndexError)
a.zip(b) # => [[12, 1], [11, 2], [21, nil]]
b.zip(a) # => [[1, 12], [2, 11]]
That to apply the #transpose method a and b should be of the same size. But for applying #zip, it is not needed b to be of the same size of a, ie b and a can be of any of size.
With #zip, the resultant array size will always be the size of self. With #transpose the resulting array size will be any of the inner array's size of self.
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