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Immutable Data With Immer Using immutable data structures provides many benefits, including making your code easier to reason about and less prone to bugs.

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HELLO Vitor Alencar @vitormalencar

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Immutable State Structural sharing Currying Detect and distribute changes in data Today we’re looking at updates and new features regarding...

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Functional Programming

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Why Immutability is so important ?

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Is deletable ?

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Using immutable data structures provides many benefits, including making your code easier to reason about and less prone to bugs.

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WHY ● Immutable objects are simpler to construct, test, and use ● Truly immutable objects are always thread-safe ● They help to avoid temporal coupling ● Their usage is side-effect free

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Aug 4, 2014

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nice but….

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Immer

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Keeps previous state, produces new next state

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How does Immer work?

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● Proxy root ● Lazily create proxy when a field is dereferenced ● Upon write, create shallow clone ● Upon finish, combine clones, freeze the modified objects

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Immutable State

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Currying

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Even Better

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Hooks

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Hooks

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Performance

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● Immutability with normal JavaScript objects, arrays, Sets and Maps. No new APIs to learn! ● Strongly typed, no string based paths selectors etc. ● Structural sharing out of the box ● Object freezing out of the box ● Deep updates are a breeze ● Boilerplate reduction. Less noise, more concise code. ● First class support for patches ● Small size 6kb Benefits

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Obrigado!