RUBY REVERSE MERGE

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Ruby - NoMethodError: undefined method `reverse_merge'

ruby-1.9.2-p180 :007 > a = {:a => 10, :b => 20} => {:a=>10, :b=>20} ruby-1.9.2-p180 :008 > a.reverse_merge({:c => 30}) NoMethodError: undefined method `reverse_merge ...

How can I merge two hashes without overwritten duplicate keys in Ruby ...

Sorted by: 266. If you have two hashes, options and defaults, and you want to merge defaults into options without overwriting existing keys, what you really want to do is the reverse: merge options into defaults: options = defaults.merge (options) Or, if you're using Rails you can do: options.reverse_merge! (defaults)

How to Merge Two Hashes Without Overwritten Duplicate Keys in Ruby ...

If you have two hashes, options and defaults, and you want to merge defaults into options without overwriting existing keys, what you really want to do is the reverse: merge options into defaults: options = defaults.merge (options) Or, if you're using Rails you can do: options.reverse_merge! (defaults)

Hash - Ruby on Rails

By default the root node is “hash”, but that's configurable via the :root option. The default XML builder is a fresh instance of Builder::XmlMarkup. You can configure your own builder with the :builder option. The method also accepts options like :dasherize and friends, they are forwarded to the builder.

reverse_merge! (ActiveSupport::CoreExtensions::Hash ... - APIdock

Allows for reverse merging where its the keys in the calling hash that wins over those in the other_hash. This is particularly useful for initializing an incoming option hash with default values: def setup ( options = {}) options . reverse_merge! :size => 25 , :velocity => 10 end

Define Hash#| as Hash#reverse_merge in Rails - ruby-lang.org

By having Hash#| be an alias for reverse_merge, this also wouldn't be exactly the same as reverse_merge!, but I suspect it would be effectively the same for a majority of uses. For "options" being passed in as a method parameter, I think it would be better than reverse_merge! because it doesn't modify/pollute the caller's Hash.

Ruby | Array reverse() function - GeeksforGeeks

Read. Courses @Sale. Discuss. Practice. Video. Array#reverse () : reverse () is a Array class method which returns a new array containing self’s elements in reverse order. Syntax: Array.reverse () Parameter: Array. Return: a new array containing self’s elements in reverse order.

How to Merge Two Hashes with No New Keys - ITCodar

If you have two hashes, options and defaults, and you want to merge defaults into options without overwriting existing keys, what you really want to do is the reverse: merge options into defaults: options = defaults.merge(options) Or, if you're using Rails you can do: options.reverse_merge!(defaults) Ruby - Merge two hashes and maintain ordered ...
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