当我需要'./质数时。b' in b我得到这个:
1.9.3-p392 :004 > require './primes.rb'
LoadError: cannot load such file -- ./primes.rb
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from (irb):4
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>'
这是质数。Rb文档:
# primes.rb
require 'debugger'
def prime?(num)
debugger
(1..num).each do |i|
if (num % i) == 0
return false
end
end
end
def primes(num_primes)
ps = []
num = 1
while ps.count < num_primes
primes << num if prime?(num)
end
end
if __FILE__ == $PROGRAM_NAME
puts primes(100)
end
如何得到这个工作的任何建议将非常感激!
当我要求相对时,它会给我这个:
1.9.3-p392 :010 > require_relative 'primes.rb'
LoadError: cannot infer basepath
from (irb):10:in `require_relative'
from (irb):10
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>'
当我做下面的第二个解决方案时,它给了我这个:
1.9.3-p392 :013 > $LOAD_PATH << "."
=> ["/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/x86_64-darwin11.4.2", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby/1.9.1/x86_64-darwin11.4.2", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/x86_64-darwin11.4.2", "."]
1.9.3-p392 :014 > require 'primes.rb'
LoadError: cannot load such file -- primes.rb
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from (irb):14
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>'
1.9.3-p392 :015 >
当我在pry中尝试时:
[4] pry(main)> require_relative 'primes.rb'
LoadError: cannot infer basepath
from (pry):2:in `require_relative'
[5] pry(main)> require 'primes.rb'
LoadError: cannot load such file -- primes.rb
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
[6] pry(main)> .ls
Applications Movies git-completion.bash
Desktop Music rails_projects
Documents Pictures ruby
Downloads Public runwithfriends
Dropbox code shopify
Library dev sites
[7] pry(main)> require 'ruby/app_acad_mini_curriculum/debugging/primes.rb'
LoadError: cannot load such file -- ruby/app_acad_mini_curriculum/debugging/primes.rb
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
尝试require_relative
require_relative 'primes.rb'
编辑:注意,这只能在脚本中工作。如果您试图将此脚本require
放入irb会话中,则需要提供primes.rb
的完整路径。原因是irb的位置。例如,在irb中尝试Dir.pwd
,您将看到require_relative
试图搜索primes.rb
的位置。
有两件事你可以做:
# Just need to require the one file.
require_relative File.join('users', 'yourusername', 'prime_folder', 'prime.rb')
# Many files in the same folder
$LOAD_PATH << File.join('users', 'yourusername', 'prime_folder')
require 'prime.rb'
require 'another_file.rb'
我使用的另一个选项是Pry。它类似于irb,很容易从脚本调用。它是一颗宝石,所以:
gem install pry
在脚本末尾,您可以这样做:
if $0 == __FILE__
require 'pry'
binding.pry
end
然后放入一个类似REPL的irb,在那里可以测试和调试您的方法。没有它我活不下去。
与ruby 1.8不同,您不能要求文件位于同一文件夹中,因为当前文件夹不再位于加载路径上。
要模拟ruby 1.8的行为,您可以尝试
$LOAD_PATH << "."
require 'primes.rb'
然而,正如@CharlesCaldwell指出的那样,在ruby 1.9中正确的方法是使用relative_require。
这里有一个很好的讨论处理这个问题的最佳方法。
注意relative_require
不能在irb中工作。你可以在@CharlesCaldwell的回答上查看动机。
但是看看你的任务问题,你不应该用irb,你应该用pry:
我们将使用两个宝石。一种叫做Pry,它是irb的替代品。您必须gem install撬。对于调试来说,使用Pry并不是必须的,但它会让你的工作变得更好。
下面是一个使用相对要求的例子:
[fotanus@thing ~]$ cat primes.rb
# primes.rb
def prime?(num)
(1..num).each do |i|
if (num % i) == 0
return false
end
end
end
def primes(num_primes)
ps = []
num = 1
while ps.count < num_primes
primes << num if prime?(num)
end
end
if __FILE__ == $PROGRAM_NAME
puts primes(100)
end
[fotanus@thing ~]$ cat a.rb
require_relative 'primes.rb'
[fotanus@thing ~]$ ruby a.rb