in decending order puts hash.sort_by {|k, v| -k.length }.to_h > {:eeeee=>2, :dddd=>3, :ccc=>4, :bb=>2, :a=>1} # you could do any thing to determine the sort order of the key this way # a normal sort would work like this (in Ruby 2.1 or higher): hash.sort.to...
hash.sort_by { |k, v| k }.to_h 使用默认行为进行哈希排序 h = { "b" => 2, "c" => 1, "a" => 3 } h.sort # e.g. ["a", 20] <=> ["b", 30] hash.sort.to_h #=> { "a" => 3, "b" => 2, "c" => 1 } 注意:< Ruby 2.1 array = [["key", "value"...
This uses the form of Enumerable#max_by that takes an argument, which here is the number of key-value pairs in the hash. Note that max_by (and min_by, max and min) were first permitted to have an argument in Ruby v2.2. Share Follow Follow this answer to receive notifications edit...
h = Hash.new h.default = 0 A new key-value pair can be added using or thestoremethod h[key] = value or h.store(key, value) An existing key can be deleted using thedeletemethod h.delete(key) For destructive selection and deletion, we can usekeep_ifanddelete_ifas seen inArray-Sele...
method 调用普通 parameter 与 hash 的对比 不同之处: 对于parameter 来说, arguments 必须 in exactly the right order; 对于 hash 来说,这不是必要的 对于parameter 来说, required parameters have to appear before optional parameters, 对于 hash 来说, 你可以 skip 任何一个 key that you want. ...
What's the (fastest/cleanest/straightforward) way to convert all keys in a hash from strings to symbols in Ruby? This would be handy when parsing YAML. my_hash = YAML.load_file('yml') I'd like to be able to use: my_hash[:key] Rather than: my_hash['key'] ...
So what if we want to sort by hash values instead of the key’s order? Here comes the #sort_by method: hash.sort_by {|k, v|v} #=> [[:a, 1], [:b, 2], [:e, 2], [:d, 3], [:c, 4]] By default, Ruby returns the value in ascending order. If we want Ruby to re...
# return a hash end set_p p end TestCase文件如下,原则上无需修改,只需要在测试数据的Excel中编写匹配规则及预期输出,基本上实现了单个接口无编码的数据驱动测试。 require 'Preview_validate' RSpec.shared_examples "Preview Example" do |key,requestData,expData| ...
When I first declared “Ruby3x3” in the conference keynote, many including members of the core team felt “Matz is a boaster”. In fact, I felt so too. But we did. I am honored to see the core team actually accomplished to make Ruby3.0 three times faster than Ruby2.0 (in some be...
male=person.delete(:name)# => Immutable::Hash[:gender => :male]person# => Immutable::Hash[:name => "Simon", :gender => :male]male.key?(:name)# => falseperson.key?(:name)# => true Since it is immutable,Immutable::Hashdoesn't provide an assignment (Hash#[]=) method. However...