Ruby Array.zip用法及代碼示例

zip(*other_arrays) → new_array

zip(*other_arrays) {|other_array| ... } → nil

當沒有給出塊時，返回一個大小為self.size的新數組new_array，其元素是數組。

每個嵌套數組 new_array[n] 的大小為 other_arrays.size+1 ，並包含：

• self 的 nth 元素。

• 每個 other_arrays 的 nth 元素。

如果所有 other_arrays 和 self 的大小相同：

a = [:a0, :a1, :a2, :a3]
b = [:b0, :b1, :b2, :b3]
c = [:c0, :c1, :c2, :c3]
d = a.zip(b, c)
d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]

如果 other_arrays 中的任何數組小於 self ，則使用 nil 填充到 self.size ：

a = [:a0, :a1, :a2, :a3]
b = [:b0, :b1, :b2]
c = [:c0, :c1]
d = a.zip(b, c)
d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, nil], [:a3, nil, nil]]

如果 other_arrays 中的任何數組大於 self ，則忽略其尾隨元素：

a = [:a0, :a1, :a2, :a3]
b = [:b0, :b1, :b2, :b3, :b4]
c = [:c0, :c1, :c2, :c3, :c4, :c5]
d = a.zip(b, c)
d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]

當給定一個塊時，用每個子數組(如上形成)調用該塊；返回零

a = [:a0, :a1, :a2, :a3]
b = [:b0, :b1, :b2, :b3]
c = [:c0, :c1, :c2, :c3]
a.zip(b, c) {|sub_array| p sub_array} # => nil

輸出：

[:a0, :b0, :c0]
[:a1, :b1, :c1]
[:a2, :b2, :c2]
[:a3, :b3, :c3]