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Ruby 2.5: What's New and What's Cool
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Bryce "BonzoESC" Kerley
January 15, 2018
Programming
0
63
Ruby 2.5: What's New and What's Cool
Miami Ruby Brigade
Monday, January 15, 2018
Bryce "BonzoESC" Kerley
January 15, 2018
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Transcript
Ruby 2.5 What's New and What's Cool Miami Ruby Brigade
Monday, January 15, 2018
tl;dr • feature and performance update release • new features
are cool • some stuff is faster • some stdlibs are now default gems • some other bits & bobs have changed
Topics • Intro • Features • Demos • Q&A
https://www.ruby-lang.org/en/news/2017/12/25/ruby-2-5-0-released/
Getting Ruby 2.5 • rbenv • Docker hub • Heroku
• rvm
Running an App? Go for it (With adequate testing)
Maintaining a Library? Know it exists and test with it
do / rescue / end Exception handling in a block
doesn't require begin
https://github.com/bkerley/mastodon/commit/589cdff
Object#yield_self Similar to #tap but it returns the result instead
of the receiver
None
Hash#slice Grabs a sub-hash with the given keys
https://github.com/bkerley/tides_and_currents/commit/bbb8ab78
Hash#transform_keys • Returns a new hash with the keys mapped
to something new
None
Struct.new keyword Struct#new supports keyword arguments now
None
Enumerable#any? #all? #none? #one? threequals Find if members in a
collection threequal some pattern
None
None
Reverse backtraces • Quality of life • On a terminal,
unless you change $stderr, the most recent call is at the bottom instead of a million screens up
None
Topics • Intro • Features • Demos • Q&A
Upgrading Mastodon I decided to make Mastodon work in Ruby
2.5
Mastodon • Twitter-like • Open-source • Federated • Independent nodes
Setup Steps From a new Mastodon checkout on v2.1.3, and
after Development setup steps 1. Update README.md to note that it's a weird research project 2. Remove "< 2.5.0" constraint on Ruby version from Gemfile 3. bundle 4. Some deps also have "< 2.5.0" ruby constraint 5. bundle update
app/models/media_attachment.rb def populate_meta meta = {} file.queued_for_write.each
do |style, file| begin geo = Paperclip::Geometry.from_file file meta[style] = { width: geo.width.to_i, height: geo.height.to_i, size: "#{geo.width.to_i}x#{geo.height.to_i}", aspect: geo.width.to_f / geo.height.to_f, } rescue Paperclip::Errors::NotIdentifiedByImageMagickError meta[style] = {} end end meta end
None
app/models/media_attachment.rb def populate_meta meta = {} file.queued_for_write.each
do |style, file| begin geo = Paperclip::Geometry.from_file file meta[style] = { width: geo.width.to_i, height: geo.height.to_i, size: "#{geo.width.to_i}x#{geo.height.to_i}", aspect: geo.width.to_f / geo.height.to_f, } # rescue Paperclip::Errors::NotIdentifiedByImageMagickError # meta[style] = {} end end meta end
None
app/models/media_attachment.rb def populate_meta meta = {} file.queued_for_write.each
do |style, file| geo = Paperclip::Geometry.from_file file meta[style] = { width: geo.width.to_i, height: geo.height.to_i, size: "#{geo.width.to_i}x#{geo.height.to_i}", aspect: geo.width.to_f / geo.height.to_f, } rescue Paperclip::Errors::NotIdentifiedByImageMagickError meta[style] = {} end meta end
None
https://github.com/bkerley/mastodon/commit/589cdff
tides_and_currents • Code for Miami project • Gets tides and
currents data from NOAA • Quick and dirty ruby scripts
get_stations.rb field_names = %w{geoGroupName stationId lat lon} #
… out_json = doc['stationList'].map do |stn| # … field_names.map do |fn| stn[fn] end end.compact
None
get_stations.rb field_names = %w{geoGroupName stationId lat lon} #
… out_json = doc['stationList'].map do |stn| # … stn.slice(*field_names).values end.compact
None
https://github.com/bkerley/tides_and_currents/commit/bbb8ab78
Topics • Intro • Features • Demos • Q&A
Thanks