unless的用法if(x<5) then statement1 end unless x>=5 then statement1 end 这两句是对等的 if x<5 then statement1 else statement2 end unless x<5 then statement2 else statement1 end 也对等 unless 用来检验后面条件是否为假, 若假则执行后续代码, 若真则执行else (unless 相当于 if not)比较运算...
问Ruby -If-Else语句(三角测试)EN在编程中，条件语句是一种基本的控制结构，用于根据特定的条件执行不...
when/^\s*#/ # If input looks like a comment...next#skip to the next line.when /^quit$/i#If input is "quit" (case insensitive)...break#exit the loop.else#Otherwise...puts line.reverse#reverse the user's input and print it.end end A when clause can have more than one expressio...
# 控制流 if true "if statement" elsif false "else if, optional" else "else, also optional" end for counter in 1..5 puts "iteration #{counter}" end #=> iteration 1 #=> iteration 2 #=> iteration 3 #=> iteration 4 #=> iteration 5 # 然而 # 没人用for循环 # 用`each`来代替,就...
问在ruby case..end中有没有什么方法可以使用if else呢？ENPython有两种数据类型，它们共同构成了使用...
if和unless是相反的条件判断,它们语法完全一样。 ruby 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 # 其中then可以省略 ifCONDITIONthen STATEMENT end ifCONDITIONthen STATEMENT1 else STATEMENT2 end ifCONDITION1then STATEMENT1 elsifCONDITION2 ...
条件语句:if ,then ,else ,elsif ,case ,when ,unless 循环语句:for ,in ,while ,until ,next,break ,do ,redo ,retry ,yield 逻辑判断:not ,and ,or 逻辑值和空值:true ,false ,nil 异常处理:rescue ,ensure 对象引用:super ,self 块的起始:begin/end ...
"if statement" # (译注:条件语句) elsif false "else if, optional" # (译注:可选的 else if 语句) else "else, also optional" # (译注:同样也是可选的 else 语句) end for counter in 1..5 puts "iteration #{counter}" end #=> iteration 1 ...
RUBY入门,问下 if 语句与 unless语句的区别10 在书上看到 if(x<5) then statement1 end unless x>=5 then statement1 end 这两句是对等的 if x<5 then statement1 else statement2 end unless x<5 then statement2 else statement1 end 也对等 这个if 与 unless 一般使用哪种比较多,各区别和好处有...
Whenever you need to use someif / elsifstatements you could consider using a Ruby case statement instead. In this post, you will learn a few different use cases and how it all really works under the hood. Note: In other programming languages this is known as aswitchstatement. ...