Ruby：从阵列中的多个赋值中丢弃变量

Question

对于从数组中给定的变量赋值：

a,b,c,d,e = [ "foo","bar","discard","discard","blah" ]

有没有办法只分配a，b和e并放弃c和d？ perl（Perl assignment with a dummy placeholder）中是否有undef之类的内容。

Answer 1

是

a,b,_,_,e = [ "foo","bar","discard","discard","blah" ]

Answer 2

您可以使用 splat 运算符。

 a,b,*,e = ["foo","bar",nil,nil,"blah"]

Answer 3

如果阵列很长，这是另一种选择：

a,b,e = [ "foo","bar","discard","discard","blah" ].values_at(0,1,4)