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Javascript Funcional
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Igor Soares
July 07, 2016
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Javascript Funcional
Palestra sobre Javascript Funcional
hack.river São José do RIo Preto
Igor Soares
July 07, 2016
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Transcript
Javascript Funcional uma breve Introdução
github.com/ripfoghorn twitter.com/ripfoghorn_ 20 anos desenvolvedor back-end por 3 anos entusiasta
de robôs gigantes
Programação Funcional?
Paradigma de programação que trata a computação como uma avaliação
de funções matemáticas e que evita estados ou dados mutáveis.
?
Paradigma
Funções puras Imutabilidade de estado Composição de funções Redução de
código
Matemática
f(x) = 2x + 1
f(3) = 2(3) + 1 = 7
g(y) = y + 5
f(g(y)) = f(y + 5) = 2(y + 5) +
1 = 2y + 11
Programação Funcional == Matemática
Funções
function f(x) { return 2*x + 1; }
function g(y) { return y + 5; }
console.log(f(g(3)));
17
Funções de ordem superior e funções de primeira classe
var composta = function(a) { return f(g(a)); }
composta(3) //=> 17 composta(4) //=> 19
Composição
var add1= function(x){ return x + 1; }
var quadrado = function(x){ return x * x; }
var f = function(x) { return add1(quadrado(x)); }
console.log(f(7)) ??
50
Funções Puras Imutabilidade de estado
function pura(a, b) { return a + b; }
var a = 1; function impura(b) { return a +
b; }
a = new Date().getDay();
Estado
f(x) = 2x f(2) = 4
Arrays!
Curry!
OK, mas por que Javascript mesmo?
Node NPM Full-stack
ES6 Arrow Functions Map Reduce Filter ...
IIFE’s
(function() {...})(); (()=> {...})();
Underscore Lodash Ramda Immutable Fn Function
Fun();
Obrigado!