ruby 数组将 first，second 放入变量，其余放入另一个变量

Question

我想把一个数组分成三个变量；第一个值放入一个变量，第二个值放入另一个变量，其余所有放入一个字符串，例如:

arr = ["a1","b2","c3","d4","e5","f6"]
var1 = arr[0] # var1 => "a1"
var2 = arr[1] # var2 => "b2"
var3 = ? # var3 should be => "c3d4e5f6"

需要什么代码来实现每个变量的列出值？

Answer 1

这看起来和任何东西一样好:

arr = ["a1","b2","c3","d4","e5","f6"]
var1 = arr[0]            # => "a1"
var2 = arr[1]            # => "b2"
var3 = arr[2..-1].join   # => "c3d4e5f6"

如果你不需要保留arr，你可以这样做:

arr = ["a1","b2","c3","d4","e5","f6"]
var1 = arr.shift   # => "a1"
var2 = arr.shift   # => "b2"
var3 = arr.join    # => "c3d4e5f6"

别人都在指出splat运算符，可以理解，但我觉得这个比上面的还差:

arr = ["a1","b2","c3","d4","e5","f6"]
var1, var2, *tmp = arr
var3 = tmp.join

是这样的:

arr = ["a1","b2","c3","d4","e5","f6"]
var1, var2, *var3 = arr
var3 = var3.join

不过，这是一个需要注意的选项。