Ruby x,y = gets.split.map &:to_i [英] Ruby x,y = gets.split.map &:to_i

问题描述

我对这行 ruby​​ 代码感到困惑.为什么赋值给 x、y 而不是单个变量?

I am confused about this line of ruby code. Why is the assignment given to x, y and not a single variable?

x,y = gets.split.map &:to_i

推荐答案

相反，这将数组中的第一个条目分配给 x，将第二个条目分配给 y分配给单个变量，在这种情况下，数组将分配给该变量.

This assigns the first entry from the array to x, and the second entry to y in contrast to assigning to a single variable in which case the array would be assigned to that variable.

将多个变量放在赋值的左侧是一种将数组解包为单独变量的方法.你可以在 irb 中试试这个:

Putting multiple variables on the left hand side of an assignment is a way of unpacking an array into separate variables. You can try this in irb:

irb(main):001:0> numbers = [1, 2, 3]
=> [1, 2, 3]
irb(main):002:0> first, second = numbers
=> [1, 2, 3]
irb(main):003:0> first
=> 1
irb(main):004:0> second
=> 2

查看我写的这个对旧问题的回答它提供了更多详细信息，并且是一个很好的例子，说明了它的用处.

Check out this answer to an older question that I wrote which gives some more details and is a good example of where this can be useful.

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