Fun with Functional JavaScript - Kuba Waliński - Codemotion Rome 2015

Fun with Functional JavaScript - Kuba Waliński - Codemotion Rome 2015

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  ROME 27-28 march2015 Fun with Functional JavaScript @kubawalinski kubawalinski@gmail.com blog.kubawalinski.com github.com/kubawalinski ABB Łódź, Poland Kuba Waliński
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  ROME 27-28 march2015 - Speaker’s name Functional Programming • Functions as first class citizens • can be stored in variables and data structures • higher order functions • can be passed as arguments to functions • can be returned from functions • Pure functions • always the same result for the same params - caching • independent from other function calls - parallelism • no side effects - compiler optimisations • Immutability • Recursion • tail call optimisation
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  ROME 27-28 march2015 - Speaker’s name Functional JavaScript?! • first class functions :) • closures :) • lambdas (anonymous functions) :) • pure functions :| • immutability :| • tail call optimisation :(
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  ROME 27-28 march2015 - Speaker’s name lodash • very useful "utility belt" library • port of underscore.js (comes from _) • provides loads of functions to manipulate • arrays • collections • functions • objects • supports curry/partial application
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  ROME 27-28 march2015 - Speaker’s name functional.js • a functional programming library for JavaScript • created by Lee Crossley • in constant development and use • gaining traction • 100+ daily npm downloads • over 40 github stars • currying implemented by default • parameter order optimised for partial application
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  ROME 27-28 march2015 - Speaker’s name EcmaScript 6 aka ES.next aka Harmony • arrow functions • tail call recursion optimisation • destructuring arrays and objects • spread operator • rest parameters
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  ROME 27-28 march2015 - Speaker’s name Conclusions • Functional programming in JS is lots of fun! • A new way to look at the language • A welcome challenge for every programmer • Reduces the amount of code you have to • Write • Read • Reason about • Debug • Maintain • Increases code readability • Rapidly developing • new frameworks & libraries • new language features
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  ROME 27-28 march2015 - Speaker’s name Sources • http://dailyjs.com/2012/09/14/functional-programming/ • https://lodash.com/ • http://functionaljs.com/ • http://nullobject.github.io/fkit/ • http://eliperelman.com/fn.js/ • http://fogus.github.io/lemonad/ • https://leanpub.com/javascript-allonge • http://www.functionaljavascript.com/ • http://bit.ly/cmr2015-functionaljs
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  ROME 27-28 march2015 - Speaker’s name Leave your feedback on Joind.in! https://joind.in/event/view/3347 http://bit.ly/cmr2015-feedback
• 10.
  ROME 27-28 march2015 - Speaker’s name Leave your feedback on Joind.in! https://joind.in/event/view/3347 http://bit.ly/cmr2015-feedback