Ruby中的.length和.length()有什么区别？
我只是想知道是否.length()只是一个别名，.length因为它们返回相同的结果：
[38] pry(main)> temp = [1,2,3]
=> [1, 2, 3]
[40] pry(main)> temp.length
=> 3
[41] pry(main)> temp.length()
=> 3
回答
没有区别。在 Ruby 中，您可以在许多情况下省略参数周围的括号。
temp.length
temp.length()
是相同的。同样适用于
temp.push(4)
temp.push 4
- It's worth mentioning that there are cases where you want to use them, or need to, like in the case of `temp.push 4 * 5` or `temp.push(4) * 5` which mean two very different things.