Hooks contains our logic code in our React app.
We can create our own hooks and use hooks provided by other people.
In this article, we’ll look at some useful React hooks.
react-hanger
The react-hanger library comes with various hooks we can use to do various things.
To install it, we run:
yarn add react-hanger
We can use the useArray hook to manipulate arrays easily.
For example, we can write:
import React from "react";
import { useArray } from "react-hanger";
export default function App() {
const todos = useArray(["eat", "drink", "sleep"]);
return (
<>
<button onClick={() => todos.push("new task")}>push new task</button>
<button onClick={() => todos.unshift("new task")}>
unshift new task
</button>
<button onClick={() => todos.pop()}>pop new task</button>
<p>{todos.value.join(", ")}</p>
</>
);
}
The useArray hook returns an object with various methods for changing the array.
It also returns the value property with the state of the array.
We call the push method to append something to the array.
unshift adds an item to the beginning of the array.
pop removes an item from the end of the array.
It also has the useStateful hook to let us set a state.
For example, we can write:
import React from "react";
import { useStateful } from "react-hanger";
export default function App() {
const toggle = useStateful(true);
return (
<>
<button onClick={() => toggle.setValue(!toggle.value)}>toggle</button>
<p>{toggle.value.toString()}</p>
</>
);
}
We use the useStateful hook as we do with the useState hook.
The useMap hook let us hold a map as a state and manipulate it.
For instance, we can write:
import React from "react";
import { useMap } from "react-hanger";
export default function App() {
const { value, set, delete: del, clear } = useMap([["key", "value"]]);
return (
<>
<button onClick={() => set("foo", "bar")}>add entry</button>
<button onClick={() => del("foo")}>delete entry</button>
<button onClick={() => clear()}>clear</button>
<p>{value}</p>
</>
);
}
We use the useMap hook.
We passed an array to it with the key and value of the map.
Then it returns the value and various methods we can use to manipulate the map.
set adds an entry by passing in the key and value.
delete lets us delete an entry with the given key,
clear clears the map.
We can also pass a Map instance into the hook and get the same result.
The useSetState hook lets us manage our state as we did with the setState method in React class components.
To use it, we can write:
import React from "react";
import { useSetState } from "react-hanger";
export default function App() {
const { state, setState, resetState } = useSetState({ loading: false });
return (
<>
<button onClick={() => setState({ loading: !state.loading })}>
set state
</button>
<button onClick={() => resetState()}>reset state</button>
<p>{JSON.stringify(state)}</p>
</>
);
}
The useSetState hook takes an object with the states we want to manage.
The argument is the initial state.
It returns the state with all the states.
setState lets us set the state as we do with setState in React class components.
resetState will reset the state to the initial state.
Conclusion
The react-hanger library comes with many useful hooks to manage various kinds of states.
