2つのルビ配列を不等にインターリーブする

Question

2つの配列を正確に交互に挿入することなくインターリーブしたいと思います。例えば、与えられた：

a = [1,2,3,4,5,6,7,8,9] 
b = ['a','b','c'] 

私は出力としてf = [1,2,'a',3,4,'b',5,6,'c',7,8,9]受信したいと思います。私はaの2つの要素ごとに1つの要素をbにします。

a = [1,2,3,4,5,6,7,8,9] 
b = ['a','b','c'] 

even, odd = a.partition.each_with_index{ |_, i| i.even? } 
res = even.zip(odd,b) 
res = res.flatten.reject(&:blank?) 
#=> [1, 2, "a", 3, 4, "b", 5, 6, "c", 7, 8, 9] 

が、私は、このソリューションで興奮していないよ：

ソリューションがあるように思われます。何か案は？

Answer 1

a.each_slice(2).zip(b).flatten 
#=> [1, 2, "a", 3, 4, "b", 5, 6, "c"] 

Answer 2

あなたは（あなたが提供してきたことを、両方の例については）次のことを試すことができます。

b.zip(a.each_slice(2)).map(&:reverse).flatten 
# => [1, 2, "a", 3, 4, "b", 5, 6, "c"] 

Demonstration

Answer 3

これは（b.size > a.sizeを含む）任意のサイズの配列aとbのために働きますマージされた配列内のaからの要素のシーケンスの長さが最大でも1つだけ異なることを保証します。同じことが、の配列の場合にも当てはまる。b.size > a.size。

def insert_em(a,b) 
    b.size <= a.size ? recurse(a,b) : recurse(b,a) 
end 

def recurse(a,b) 
    i = a.size/(b.size+1) 
    b.size == 1 ? a[0,i] + b + a[i..-1] : 
    [*a[0,i], b.first].concat(recurse(a[i..-1], b[1..-1])) 
end 

a = [1,2,3,4,5,6,7,8,9] 

insert_em a, ['a'] 
    #=> [1, 2, 3, 4, "a", 5, 6, 7, 8, 9] 
insert_em a, ['a','b'] 
    #=> [1, 2, 3, "a", 4, 5, 6, "b", 7, 8, 9] 
insert_em a, ['a','b','c'] 
    #=> [1, 2, "a", 3, 4, "b", 5, 6, "c", 7, 8, 9] 
insert_em a, ['a','b','c','d'] 
    #=> [1, "a", 2, 3, "b", 4, 5, "c", 6, 7, "d", 8, 9] 
insert_em a, ['a','b','c','d','e'] 
    #=> [1, "a", 2, "b", 3, "c", 4, 5, "d", 6, 7, "e", 8, 9] 
insert_em a, ['a','b','c','d','e','f'] 
    #=> [1, "a", 2, "b", 3, "c", 4, "d", 5, "e", 6, 7, "f", 8, 9] 
insert_em a, ['a','b','c','d','e','f','g'] 
    #=> [1, "a", 2, "b", 3, "c", 4, "d", 5, "e", 6, "f", 7, "g", 8, 9] 
insert_em a, ['a','b','c','d','e','f','g','i'] 
    #=> [1, "a", 2, "b", 3, "c", 4, "d", 5, "e", 6, "f", 7, "g", 8, "i", 9] 
insert_em a, ['a','b','c','d','e','f','g','i','j'] 
    #=> ["a", 1, "b", 2, "c", 3, "d", 4, "e", 5, "f", 6, "g", 7, "i", 8, "j", 9] 
insert_em a, ['a','b','c','d','e','f','g','i','j','k'] 
    #=> ["a", 1, "b", 2, "c", 3, "d", 4, "e", 5, "f", 6, "g", 7, "i", 8, "j", 9, "k"] 
insert_em a, ['a','b','c','d','e','f','g','i','j','k','l'] 
    #=> ["a", 1, "b", 2, "c", 3, "d", 4, "e", 5, "f", 6, "g", 7, "i", 8, "j", 9, "k", "l"]