在Ruby上编写一个具有已定义函数的新文件_Ruby_Function

在Ruby上编写一个具有已定义函数的新文件

ruby function

在Ruby上编写一个具有已定义函数的新文件,ruby,function,Ruby,Function,在练习19的《学习Ruby的艰难之路》一书中，它说人们应该使用提供的函数： def cheese_and_crackers(cheese_count, boxes_of_crackers) puts "You have #{cheese_count} cheeses!" puts "You have #{boxes_of_crackers} boxes of crackers!" puts "Man that's enough for a party!" puts "Get a

在练习19的《学习Ruby的艰难之路》一书中，它说人们应该使用提供的函数：

def cheese_and_crackers(cheese_count, boxes_of_crackers)
  puts "You have #{cheese_count} cheeses!"
  puts "You have #{boxes_of_crackers} boxes of crackers!"
  puts "Man that's enough for a party!"
  puts "Get a blanket.\n"
end

并用它探索不同的方法。我尝试探索函数的参数并用它编写文本：

file = ARGV.first

puts "Let's make a test?"
puts "Does the output file exist? #{File.exist?(arquivo)} "
puts "Ready, hit RETURN to continue, CTRL-C to abort."

$stdin.gets

def success(price, recipe)
  puts """Text goes on like this:
  In order to become a coder, You must dedicate yourself.\n
  For that, you must pay a price, such as #{price}\n
  Becoming a coder also requires #{recipe}\n"""
end

puts "What is the price to pay in order to become a coder?"
price = $stdin.gets
puts "What are the fundamental components in order to become a coder?"
recipe = $stdin.gets

coder = success(price, recipe)

motivational = File.open(file, 'w')
motivational.write(coder)

puts "Read this every day."

但我似乎无法让它将函数写入新的

test.txt

文件。

test.txt

文件显示为空。

调用

put

时，您正在写入stdout，但返回值将为空

更改此项：

def success(price, recipe)
  return """Text goes on like this:
  In order to become a coder, You must dedicate yourself.\n
  For that, you must pay a price, such as #{price}\n
  Becoming a coder also requires #{recipe}\n"""
end

然后还：

motivational.close()

编辑：这里有一个扩展的解释：当调用

put

时，您只是将字符串写入stdout，这是程序的默认输出。方法（函数）可以有一个返回值。对于

success

方法，需要返回字符串，以便将其写入文件。如果调用

put

而不是

return

，则

success

方法将不会返回任何值，因此将文件保留为空

至于

close（）

调用，建议在脚本结束之前关闭文件流

有关更多信息，请查看这些参考资料：

调用

put

时，您正在写入标准输出，但返回值将为空