README.md

🙋‍♂️ Made by @thekitze, improved by @rip212

Other projects:

• 🏫 React Academy - Interactive React and GraphQL workshops
• 💌 Twizzy - A standalone app for Twitter DM
• 💻 Sizzy - A tool for testing responsive design on multiple devices at once
• 🤖 JSUI - A powerful UI toolkit for managing JavaScript apps

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react-hanger

Set of a helpful hooks, for different specific to some primitives types state changing helpers. Has two APIs:

• First and original from v1 is based on object destructuring e.g. const { value, toggle } = useBoolean(false) (Docs below)
• Second API (recommended why?) is based on more idiomatic to React hooks API, e.g. like useState with array destructuring const [value, actions] = useBoolean(false) (Docs)

Install

yarn add react-hanger

Usage

import React, { Component } from "react";

import {
  useInput,
  useBoolean,
  useNumber,
  useArray,
  useOnMount,
  useOnUnmount
} from "react-hanger";

const App = () => {
  const newTodo = useInput("");
  const showCounter = useBoolean(true);
  const limitedNumber = useNumber(3, { lowerLimit: 0, upperLimit: 5 });
  const counter = useNumber(0);
  const todos = useArray(["hi there", "sup", "world"]);

  const rotatingNumber = useNumber(0, {
    lowerLimit: 0,
    upperLimit: 4,
    loop: true
  });

  return (
    <div>
      <button onClick={showCounter.toggle}> toggle counter </button>
      <button onClick={counter.increase}> increase </button>
      {showCounter.value && <span> {counter.value} </span>}
      <button onClick={counter.decrease}> decrease </button>
      <button onClick={todos.clear}> clear todos </button>
      <input type="text" value={newTodo.value} onChange={newTodo.onChange} />
    </div>
  );
};

Example

Open in CodeSandbox

API reference (object destructuring)

How to import?

import { useBoolean } from 'react-hanger' // will import all of functions
import useBoolean from 'react-hanger/useBoolean' // will import only this function

useStateful

Just an alternative syntax to useState, because it doesn't need array destructuring.
It returns an object with value and a setValue method.

const username = useStateful("test");

username.setValue("tom");
console.log(username.value);

useBoolean

const showCounter = useBoolean(true);

Methods:

• toggle
• setTrue
• setFalse

useNumber

const counter = useNumber(0);
const limitedNumber = useNumber(3, { upperLimit: 5, lowerLimit: 3 });
const rotatingNumber = useNumber(0, {
  upperLimit: 5,
  lowerLimit: 0,
  loop: true
});

Methods:

Both increase and decrease take an optional amount argument which is 1 by default, and will override the step property if it's used in the options.

• increase(amount = 1)
• decrease(amount = 1 )

Options:

• lowerLimit
• upperLimit
• loop
• step - sets the increase/decrease amount of the number upfront, but it can still be overriden by number.increase(3) or number.decrease(5)

useInput

const newTodo = useInput("");

<input value={newTodo.value} onChange={newTodo.onChange} />

<input {...newTodo.bindToInput} />
<Slider {...newTodo.bind} />

Methods:

• clear
• onChange
• eventBind - binds the value and onChange props to an input that has e.target.value
• valueBind - binds the value and onChange props to an input that's using only value in onChange (like most external components)

Properties:

• hasValue

useArray

const todos = useArray([]);

Methods:

• add
• clear
• removeIndex
• removeById - if array consists of objects with some specific id that you pass all of them will be removed
• move - moves item from position to position shifting other elements.

    So if input is [1, 2, 3, 4, 5]
    
    from  | to    | expected
    3     | 0     | [4, 1, 2, 3, 5]
    -1    | 0     | [5, 1, 2, 3, 4]
    1     | -2    | [1, 3, 4, 2, 5]
    -3    | -4    | [1, 3, 2, 4, 5]

useMap

const { value, set } = useMap([["key", "value"]]);
const { value: anotherValue, remove } = useMap(new Map([["key", "value"]]));

Actions:

• set
• remove
• clear
• initialize - applies tuples or map instances
• setValue

useSetState

const { state, setState } = useSetState({ loading: false });
setState({ loading: true, data: [1, 2, 3] });

Methods:

• setState(value) - will merge the value with the current state (like this.setState works in React)

Properties:

• state - the current state

usePrevious

Use it to get the previous value of a prop or a state value.
It's from the official React Docs.
It might come out of the box in the future.

const Counter = () => {
  const [count, setCount] = useState(0);
  const prevCount = usePrevious(count);
  return (
    <h1>
      Now: {count}, before: {prevCount}
    </h1>
  );
};

Migration from v1 to v2

• Migration to array based API is a bit more complex but recommended (especially if you're using ESLint rules for hooks). Take a look at this section in array API docs.
• All lifecycle helpers are got removed, please replace them with useEffect useOnMount and useOnUnmount and useLifecycleHooks:
  This:

useOnMount(() => console.log("I'm mounted!"))
useOnUnmount(() =>  console.log("I'm unmounted"))
// OR
useLifecycleHooks({ 
  onMount: () => console.log("I'm mounted!"),
  onUnmount: () => console.log("I'm unmounted!") 
})

to:

useEffect(() => {
  console.log("I'm mounted!");
  return () =>  console.log("I'm unmounted");
}, []);

• bind and bindToInput are got renamed to valueBind and eventBind respectively on useInput hook