Ruby - Array#<< 之间的区别和数组#push [英] Ruby - Difference between Array#<< and Array#push
问题描述
通过检查 Ruby 1.9.3 的文档，Array#<<和 Array#push 旨在实现将元素追加到当前数组的末尾.但是，两者之间似乎存在细微差别.
From examining the documentation for Ruby 1.9.3, both Array#<< and Array#push were designed to implement appending an element to the end of the current array. However, there seem to be subtle differences between the two.
我遇到的一个是 * 运算符可用于将整个其他数组的内容附加到当前数组中，但只能使用 #push.
The one I have encountered is that the * operator can be used to append the contents of an entire other array to the current one, but only with #push.
a = [1,2,3]
b = [4,5,6]
a.push *b
=> [1,2,3,4,5,6]
尝试使用#<<而是给出各种错误，具体取决于它是否与点运算符和/或括号一起使用.
Attempting to use #<< instead gives various errors, depending on whether it's used with the dot operator and/or parentheses.
为什么#<<不像#push 那样工作?一个实际上不是另一个的别名吗?
Why does #<< not work the same way #push does? Is one not actually an alias for the other?
推荐答案
它们非常相似，但并不完全相同.
They are very similar, but not identical.
<< 接受单个参数，并将其推送到数组的末尾.
<< accepts a single argument, and pushes it onto the end of the array.
push 另一方面，接受一个或多个参数，将它们全部推到最后.
push, on the other hand, accepts one or more arguments, pushing them all onto the end.
<< 仅接受单个对象的事实就是您看到错误的原因.
The fact that << only accepts a single object is why you're seeing the error.
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