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» CS 330 Lecture 29 – Lambdas in Java and Haskell

teaching machines

CS 330 Lecture 29 – Lambdas in Java and Haskell

April 15, 2016 by . Filed under
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cs330, lectures, spring 2016.

Agenda

Note

Today we explore how behaviors were passed around in pre-Java 8 and how Java 8 improves upon this with lambdas. We’ll see how they can used in historic APIs like Thread and JButton. Lambdas are often used with streams, a collection data structure that conservatively evaluates its elements. We won’t be discussing streams yet.

Code

LambdasTest.java

/usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:315:in `to_specs': Could not find 'coderay' (>= 0) among 94 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/var/www/.local/share/gem/ruby/3.2.0:/var/lib/gems/3.2.0:/usr/local/lib/ruby/gems/3.2.0:/usr/lib/ruby/gems/3.2.0:/usr/lib/x86_64-linux-gnu/ruby/gems/3.2.0:/usr/share/rubygems-integration/3.2.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/3.2.0:/home/johnch/.gems' , execute `gem env` for more information
	from /usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:327:in `to_spec'
	from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_gem.rb:57:in `gem'
	from ./coderay:24:in `
'

PlanetTest.java

/usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:315:in `to_specs': Could not find 'coderay' (>= 0) among 94 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/var/www/.local/share/gem/ruby/3.2.0:/var/lib/gems/3.2.0:/usr/local/lib/ruby/gems/3.2.0:/usr/lib/ruby/gems/3.2.0:/usr/lib/x86_64-linux-gnu/ruby/gems/3.2.0:/usr/share/rubygems-integration/3.2.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/3.2.0:/home/johnch/.gems' , execute `gem env` for more information
	from /usr/lib/ruby/vendor_ruby/rubygems/dependency.rb:327:in `to_spec'
	from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_gem.rb:57:in `gem'
	from ./coderay:24:in `
'