ruby-2.4 | 易学教程

After Ruby 2.4 upgrade - error while trying to load the gem 'uglifier' (Bundler::GemRequireError)

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问题 I've just upgraded my App to use Ruby 2.4.0 without any errors during the bundling process. When I try to start my server, however, I get the following error: There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError) Gem Load Error is: wrong argument type Class (expected Module) I found in other answers on this site that you need to add gem 'therubyracer' to your Gemfile, but I already have had that since the creation of my App. The latest version of NodeJS is

How does Ruby's max function order duplicates?

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I've been looking at the max method in Ruby's Enumerable mixin (v2.4.1). It's a fairly straightforward method, but how it orders items when duplicates are present is a bit confusing. For example: x = [1,2,3,4,5,6,7,8,9] x.max {|a, b| a%2 <=> b%2} => 1 10.times{|y| p x.max(y) {|a, b| a%2 <=> b%2}} [] [1] [1, 7] # why is 7 the next element after 1? [3, 1, 5] # why no more 7? [7, 3, 1, 5] # 7 is now first [9, 7, 3, 1, 5] [9, 7, 3, 1, 5, 6] [9, 7, 3, 1, 5, 4, 6] [9, 7, 3, 1, 5, 2, 4, 6] [9, 7, 5, 3, 1, 8, 6, 4, 2] # order has changed again (now seems more "natural") How is 7 chosen as the second

How does Ruby's max function order duplicates?

阅读更多关于 How does Ruby's max function order duplicates?

问题 I've been looking at the max method in Ruby's Enumerable mixin (v2.4.1). It's a fairly straightforward method, but how it orders items when duplicates are present is a bit confusing. For example: x = [1,2,3,4,5,6,7,8,9] x.max {|a, b| a%2 <=> b%2} => 1 10.times{|y| p x.max(y) {|a, b| a%2 <=> b%2}} [] [1] [1, 7] # why is 7 the next element after 1? [3, 1, 5] # why no more 7? [7, 3, 1, 5] # 7 is now first [9, 7, 3, 1, 5] [9, 7, 3, 1, 5, 6] [9, 7, 3, 1, 5, 4, 6] [9, 7, 3, 1, 5, 2, 4, 6] [9, 7, 5,