When I find the keyword "in" in ruby first time. I think maybe I can do that: 1 in (0..10) But it look like I cannot use it like that way.
当我第一次在ruby中找到关键字“in”时。我想也许我可以这样做:1英寸(0..10)但看起来我不能像那样使用它。
Then I search it in ruby-lang.org, and google it. There is no answer!
然后我在ruby-lang.org中搜索它,然后google它。没有答案!
What's the meaning of keyword "in" in ruby?
红宝石中关键词“in”的含义是什么?
2 个解决方案
#1
6
You should be able to do the following:
您应该能够执行以下操作:
for i in 0..10 do
puts i
end
The expression 1 in (0..10) that you mention won't work because a constant (1) can't vary over a range - it's a constant! You need to name a variable before the in keyword.
你提到的(0..10)中的表达式1将不起作用,因为常量(1)不能在一个范围内变化 - 它是一个常数!您需要在in关键字之前命名变量。
Hope that helps.
希望有所帮助。
See this page as well.
也请参阅此页面。
#2
0
according to the pragmatic programmers book you se it as following
根据实用的程序员预订你如下
while *name*[, *name*]... in *expression* [do | :]
body
end
so you use it in loops, sorry if this is vague, but i have only started learning ruby.
所以你在循环中使用它,对不起,如果这是模糊的,但我只是开始学习ruby。
#1
6
You should be able to do the following:
您应该能够执行以下操作:
for i in 0..10 do
puts i
end
The expression 1 in (0..10) that you mention won't work because a constant (1) can't vary over a range - it's a constant! You need to name a variable before the in keyword.
你提到的(0..10)中的表达式1将不起作用,因为常量(1)不能在一个范围内变化 - 它是一个常数!您需要在in关键字之前命名变量。
Hope that helps.
希望有所帮助。
See this page as well.
也请参阅此页面。
#2
0
according to the pragmatic programmers book you se it as following
根据实用的程序员预订你如下
while *name*[, *name*]... in *expression* [do | :]
body
end
so you use it in loops, sorry if this is vague, but i have only started learning ruby.
所以你在循环中使用它,对不起,如果这是模糊的,但我只是开始学习ruby。