query: How to avoid NoMethodError for nil elements when accessing nested hashes?
positive_passages.docid: 99162
positive_passages.text: Ruby Style: How to check whether a nested hash element exists
negative_passages.docid: 50081
negative_passages.text: When should I use nil and NULL in Objective-C?
negative_passages.docid: 90524
negative_passages.text: What does map(&:name) do in this Ruby code?
negative_passages.docid: 139521
negative_passages.text: Validating that a hash is over a specific value for two hashes with additional (known but different) input
negative_passages.docid: 98704
negative_passages.text: Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
negative_passages.docid: 154033
negative_passages.text: Rails: Opposite of Hash#to_param
negative_passages.docid: 2892
negative_passages.text: What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?
negative_passages.docid: 104022
negative_passages.text: Active resource complaining about expects an hash
negative_passages.docid: 572
negative_passages.text: Is there a default hash function for an unordered_set of a custom class?
negative_passages.docid: 115736
negative_passages.text: What's a correct and good way to implement __hash__()?
negative_passages.docid: 131211
negative_passages.text: What is attr_accessor in Ruby?
negative_passages.docid: 5931
negative_passages.text: Why can't I reverse a hash to a possible input?
negative_passages.docid: 147359
negative_passages.text: Can I retrieve a re-hashed (hash) value, for instance by additional hashing?
negative_passages.docid: 136070
negative_passages.text: How do I compare two hashes in Perl without using Data::Compare?
negative_passages.docid: 62057
negative_passages.text: How can I make hash key lookup case-insensitive?
negative_passages.docid: 146895
negative_passages.text: multiple nested wildcard - arguments not applicable
negative_passages.docid: 38109
negative_passages.text: Making hashes find each other by their values using Ruby