Merge pull request #7 from sultan99/feat/context-state

v.1.2.0

Author: sultan99

CHANGELOG.md

@@ -1,85 +1,58 @@
-# Change Log
+## v1.2.0
+**Features**
 
-All notable changes to this project will be documented in this file.
-See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+🗃️ Context state
 
-# [0.1.0](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.6...v0.1.0) (2022-04-15)
+## v1.1.2
 
-**Note:** Version bump only for package holycow
+**Bug fix**
 
+🐞 [Cannot create proxy with a non-object as target or handler](https://github.com/sultan99/holycow/issues/5).
 
+## v1.1.1
+**Bug fix**
 
+🐞 [Reset removes built-in functions](https://github.com/sultan99/holycow/issues/4)
 
+## v1.1.0
+**Feature**
 
-# [0.1.0-alpha.6](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.5...v0.1.0-alpha.6) (2021-10-19)
+📢 Signal Events
 
+## v1.0.0
+**Features**
 
-### Bug Fixes
+- 🍃 Atomic state updates
+- 🧮 Computed values come with caching and lazy evaluation
+- 📬 Subscription to state changes
+- 🧩 Utility functions (compose, curry, pick, append, update)
+- 🎣 No external dependency, [Ramda](https://github.com/ramda/ramda) library is removed
 
-* **state:** late updates ([0250064](https://github.com/sultan99/holycow/commit/025006499c2c885c429c0142b6a2da0c2d9ca4fd))
+**Breaking changes**
 
+🎬 Actions
 
+- Actions must now be wrapped with the `action` function
+- New declaration interface: `action(state => payload => { ... })`
 
+🧮 Computed values
 
+- Computed values must now be wrapped with the `computed` function
+- Payload from computed functions has been removed
+- New declaration interface: `computed(state => ...)`
 
-# [0.1.0-alpha.5](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.4...v0.1.0-alpha.5) (2021-10-14)
+## v0.1.1
+**Chore**
 
+- Update packages
+- Remove Lerna
 
-### Bug Fixes
+## v0.1.0
+**Features**
 
-* **state:** typings ([022d4d8](https://github.com/sultan99/holycow/commit/022d4d813ab4c6676500872ac250f6eb3b97ebdf))
-
-
-
-
-
-# [0.1.0-alpha.4](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.3...v0.1.0-alpha.4) (2021-10-07)
-
-
-### Bug Fixes
-
-* **state:** remove setters on unmount ([e0b8f46](https://github.com/sultan99/holycow/commit/e0b8f46eec36be51452c543cb3a17efb84c3f4e4))
-
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-
-
-# [0.1.0-alpha.3](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.2...v0.1.0-alpha.3) (2021-10-07)
-
-
-### Bug Fixes
-
-* **state:** set currying function & typings ([f97b566](https://github.com/sultan99/holycow/commit/f97b566ac1af8f2f757edcc16a6ed21974c32b75))
-
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-
-# [0.1.0-alpha.2](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.1...v0.1.0-alpha.2) (2021-09-21)
-
-
-### Bug Fixes
-
-* **state:** typing & package updates ([bc4f139](https://github.com/sultan99/holycow/commit/bc4f13915dd775de4a61ab07b823462816325f73))
-
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-
-# [0.1.0-alpha.1](https://github.com/sultan99/holycow/compare/v0.1.0-alpha.0...v0.1.0-alpha.1) (2021-06-13)
-
-
-### Bug Fixes
-
-* types and import ([9719f85](https://github.com/sultan99/holycow/commit/9719f8557cbcb7b9b5c956f83c2f9c69fab42618))
-
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-
-# 0.1.0-alpha.0 (2021-06-09)
-
-
-### Features
-
-* **state:** add create state function ([17cf2de](https://github.com/sultan99/holycow/commit/17cf2def4003a398f1d1a38c060aaead3be59e27))
+- 🧠 Greedy rendering
+- 🧮 Computed values with hook nesting
+- 🎬 Actions
+- 🗿 Static variables
+- 🤹 Selectors
+- 📎 Strongly typed with TypeScript.

README.md

@@ -103,7 +103,7 @@ An action is any piece of code that modifies the state and targets some specific
 
 Action expects a curried function as a parameter. The first function provides the state — the second one handles the action payload.
 
-```js
+```jsx
 import {createState, action} from '@holycow/state'
 
 const useAuth = createState({
@@ -164,7 +164,7 @@ useUser.set('address.street', 'Spooner')
 ### 🧮 Computed values
 A computed value is a value returned by a specified function. The function's input can be a state value or any other hook. To avoid unnecessary computations, the computed value is cached and recomputed only when the current dependency has changed. Conceptually, computed values are similar to spreadsheets' formulas or Redux memoized selectors.
 
-```js
+```jsx
 import {createState, computed} from '@holycow/state'
 
 const useUser = createState({
@@ -255,6 +255,67 @@ const {set: setUser} = useUser()
 const {set: setMessage} = useMessages()
 ```
 
+### 🗃️ Context state
+Context state is a multiple-instance state with its own scope. It is designed to create reusable nested components that share one state with their child components. It is similar to the React Context, but powered by holy state features.
+
+- Greedy rendering, meaning that only updated values trigger component rendering.
+- Computed values with caching and hook nesting.
+- Asynchronous actions.
+
+However, the state hook can only be used inside React components and does not support subscription to the state changes.
+
+The `createContextState` function creates a state and returns a tuple with a context provider and a hook. The initial context state can be overridden by a parent component. This allows you to create uncontrolled, controlled, or partially controlled components.
+
+```jsx
+import {action, createContextState} from '@holycow/state'
+
+const [Context, useCounter] = createContextState({
+  // 👇 the context initial state
+  count: 0,
+  name: `Untitled`,
+  increment: action(({set}) => () => 
+    set(`count`, value => value + 1)
+  ),
+})
+
+const Label = () => {
+  // same as the holy state hook 👇
+  const {name, count} = useCounter()
+  return <h1>{name}: {count}</h1>
+}
+
+const Button = () => {
+  const {increment} = useCounter()
+  return (
+    <button onClick={increment}>
+      Increment
+    </button>
+  )
+}
+
+// only assigned props {name, count, increment}
+// will override the initial context state
+// undefined props 👇 will be ignored
+const Counter = props => (
+  <Context value={props}>
+    <Label/>
+    <Button/>
+  </Context>
+)
+
+const App = () => {
+  const [age, setAge] = useState(21)
+  return (
+    <main>
+      // each Counter component will have it is own state
+      <Counter name='🐑 counter'/>
+      <Counter count={age} increment={() => setAge(age + 1)}/>
+      // 👆 controlled component by parent component
+    </main>
+  )
+}
+```
+
 ### 📬 State subscriptions
 We can subscribe to the state changes and get notified when the state is updated. The `subscribe` function accepts a callback function as a parameter and returns another function for unsubscription.
 
@@ -267,8 +328,8 @@ const unsubscribe = useUser.subscribe(state => {
 unsubscribe() // canceling subscription 👆
 
 // subscription to specific 👇 value
-useUser.subscribe('address.street', () => {
-  console.log('User street was changed!')
+useUser.subscribe('address.street', street => {
+  console.log(`User street was changed to ${street}`)
 })
 ```