functional programming & immutable data
TRANSCRIPT
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Functional Programming& Immutable Data
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Functional programmingFunctional programming is a programming paradigm
that treats computation as the evaluation of mathematical functions and avoids changing-state
and mutable data.
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Functional programmingIs the programming using mathematical functions
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Mathematical functionsThe representations of expressions that when called
will return ever the same result.
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I = V/R
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current(voltage,resistance) = voltage/resistance;
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current(1,1000) = 1/1000; is equal 0.001
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current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
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current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
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current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
current(1,1000) = 1/1000; is equal 0.001
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No matter how many times you apply!
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Ever result will be equal!
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Contrast
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Imperative
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This is about "how"!
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Functional
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This is about “what”!
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High-order functions
Lazy valuation
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High-order functions Is a function that takes one or more functions as arguments and
can returns a function as its result.
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Lisp, Erlang, Haskell, Javascript, Java8, Scala…
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List, HashMap, Map, Reduce, Filter, Reject, ForEach
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List, HashMap
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ReduceIterate over the list and reduce the list values in one value.
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MapIterate over a list and create other list with results of operations applied each item of list.
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High-order functions Is a function that takes one or more functions as arguments and
can returns a function as its result.
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Then! Functional programming is a style of programming that compose functions to produce
one result.
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This is a new mindset.
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Because in this scene, the minor part of your architecture is not more a "Classe", now is a "Function".
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Now you need creating pieces for transform inputted data with focus on the desired result.
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Example
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I have a list of people and I need all people who have more than 18 years old.
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Count how many times a letter repeats but only on the people who have more than 18 years old.
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When your code is divided in very small pieces is easy for you code using single
responsibility.
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You reuse more and write less.
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Debugging is simple
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The TDD and BDD is pretty simple
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You win a powerful approach for improve performance
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MemoizationIn computing, memoization is an optimization
technique used primarily to speed up computer programs by storing the results of expensive function
calls and returning the cached result
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numbers.map(sum)
P1
P2
P3
P4
Cluster
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Big Data
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Realtime applications
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Immutable dataThe value is not changed in life cycle, like constants.
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The data is created to receive changes, like variables.
Mutable data
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The biggest problems with mutable data is that you need worry with scopes, concurrency and parallelism.
Mutable data
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Immutable data is only a good idea! But in functional programing its is the main ideia.
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You couldn't change the asks, only create answers.
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This is more fluid, because the flows is very predictable.
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My motivation for this talk is about
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REDUX
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Only one entry point immutable. Single state.
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Apply reducers for produce new state.
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Simplify tests, write less and improve productivity.
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SimplesDental
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Thanks 😁