Ruby 2.5 adds Exception#full_message method
Before Ruby 2.5, if we want to log a caught exception, we would need to format it ourselves. 1class AverageService 2 attr_reader :numbers, :coerced_numbers 3 4 def initialize(numbers) 5 @numbers = numbers 6 @coerced_numbers = coerce_numbers 7 end 8 9 def average 10 sum / count 11 end 12 13 private 14 15 def coerce_numbers 16 numbers.map do |number| 17 begin 18 Float(number) 19 rescue Exception =>
Ruby 2.5 allows creating structs with keyword arguments
In Ruby, structs can be created using positional arguments. 1Customer = Struct.new(:name, :email) 2Customer.new("John", "john@example.com")Copy This approach works when the arguments list is short. When arguments list increases then it gets harder to track which position maps to which value. Here if we pass keyword argument then we won't get any error. But the values are not what we wanted. 1Custo
Ruby 2.5 enumerable predicates accept pattern argument | BigBinary Blog
Ruby 2.5.0 was recently released. Ruby has sequence predicates such as all?, none?, one? and any? which take a block and evaluate that by passing every element of the sequence to it. 1if queries.any? { |sql| /LEFT OUTER JOIN/i =~ sql } 2logger.log "Left outer join detected" 3endCopy Ruby 2.5 allows using a shorthand for this by passing a pattern argument. Internally case equality operator(===) is
Ruby 2.5 added yield_self | BigBinary Blog
Ruby 2.5 added a new method named yield_self. It yields the receiver to the given block and returns output of the last statement in the block. 1irb> "Hello".yield_self { |str| str + " World" } 2 => "Hello World"Copy How is it different from try in Rails ? Without a method argument try behaves similar to yield_self. It would yield to the given block unless the receiver is nil and returns the output
Ruby 2.5 added delete_prefix and delete_suffix methods
Ruby 2.4 Let's say that we have a string Projects::CategoriesController and we want to remove Controller. We can use chomp method. 1irb> "Projects::CategoriesController".chomp("Controller") 2=> "Projects::Categories"Copy However if we want to remove Projects:: from the string then there is no corresponding method of chomp. We need to resort to sub. Naotoshi Seo did not like using regular expressio
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Ruby 2.5 added Hash#slice method
Ruby 2.5 allows rescue/else/ensure inside do/end blocks
