New features in Ruby 2.4
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New Features in Ruby 2.4 Ireneusz Skrobiś Lead Developer @ Selleo
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Transcript of New features in Ruby 2.4
New Features in Ruby 2.4
Ireneusz SkrobiśLead Developer @ Selleo
New #sum method for Enumerable
New #sum method for Enumerable
[1, 1, 2, 3, 5, 8, 13, 21].sum # => 54
New #sum method for Enumerable
[1, 1, 2, 3, 5, 8, 13, 21].sum # => 54
The #sum method has an optional parameter which defaults to 0.This value is the starting value of a summation meaning that [].sum is 0.
Faster Array#min and Array#max
Faster Array#min and Array#max
Array#min: 35.1 i/s
Enumerable#min: 21.8 i/s - 1.61x slower
Extract named captures from Regexp match results
Extract named captures from Regexp match results
pattern = /(?<first_name>John) (?<last_name>\w+)/pattern.match('John Backus').named_captures# => {"first_name" => "John", "last_name" => "Backus"}
Extract named captures from Regexp match results
pattern = /(?<first_name>John) (?<last_name>\w+)/pattern.match('John Backus').named_captures# => {"first_name" => "John", "last_name" => "Backus"}
pattern = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/pattern.match('2016-02-01').values_at(:year, :month) # => ["2016", "02"]
Faster regular expressions with Regexp#match?
Faster regular expressions with Regexp#match?
Regexp#match?: 2630002.5 i/s
Regexp#===: 872217.5 i/s - 3.02x slower
Regexp#=~: 859713.0 i/s - 3.06x slower
Regexp#match: 539361.3 i/s - 4.88x slower
New methods for testing if directories/files are empty
New methods for testing if directories/files are empty
Dir.empty?('empty_directory') # => true
Dir.empty?('directory_with_files') # => false
File.empty?('contains_text.txt') # => false
File.empty?('empty.txt') # => true
New Integer#digits method
New Integer#digits method
123.digits # => [3, 2, 1]123.digits[0] # => 3
New Integer#digits method
123.digits # => [3, 2, 1]123.digits[0] # => 3
# Equivalent behavior in Ruby 2.3:123.to_s.chars.map(&:to_i).reverse # => [3, 2, 1]
Moves configuration to Logger’s constructor
Moves configuration to Logger’s constructor
logger = Logger.new(STDOUT, level: :info, progname: 'LOG')
Moves configuration to Logger’s constructor
logger = Logger.new(STDOUT, level: :info, progname: 'LOG')
# Equivalent behavior in Ruby 2.3:logger = Logger.new(STDOUT)logger.level = :infologger.progname = 'LOG'
Simplified integers
Simplified integers
# Find classes which subclass the base "Numeric" class:numerics = ObjectSpace.each_object(Module).select { |mod| mod < Numeric }
Simplified integers
# Find classes which subclass the base "Numeric" class:numerics = ObjectSpace.each_object(Module).select { |mod| mod < Numeric }
# In Ruby 2.3:numerics # => [Complex, Rational, Bignum, Float, Fixnum, Integer, BigDecimal]
Simplified integers
# Find classes which subclass the base "Numeric" class:numerics = ObjectSpace.each_object(Module).select { |mod| mod < Numeric }
# In Ruby 2.3:numerics # => [Complex, Rational, Bignum, Float, Fixnum, Integer, BigDecimal]
# In Ruby 2.4:numerics # => [Complex, Rational, Float, Integer, BigDecimal]
New arguments supported for float modifiers
New arguments supported for float modifiers
4.55.ceil(1) # => 4.6
4.55.floor(1) # => 4.5
4.55.truncate(1) # => 4.5
4.55.round(1) # => 4.6
You can find more information here
https://blog.blockscore.com/new-features-in-ruby-2-4/
Thank you!Live long and prosper :)
Ireneusz SkrobiśLead Developer @ Selleo
