Hooks

The sets of hooks

Current implemented:

• useState()
• useEvent()
• useMemo()
• usePipe
• useDebounce
• useCurry
• useCompose
• useThrottle

Using

Direct into browser

<script src="https://cdn.jsdelivr.net/npm/@olton/hooks@latest"></script>
<script>
    Hooks.useEvent({...})
</script>

NPM

npm i --save @olton/hooks

import {useState} from "@olton/hooks"

const [state, setState] = useState(0)

Description

useState

If you are using React, you are known a hook useState ;) This is analogue for using in outside a React.

The function useState - returns a tuple with two functions: state() - getter and setState() - setter. useState can take two parameters: initial value for state and event handler for state changing (optional).

Example of usage:

<button id="bt1">Clicks (0)</button>
<button id="bt2">Clicks (0)</button>

function onStateChange(){
    console.log([...arguments])
}

{
    const [state1, setState1] = Hooks.useState(0, onStateChange)
    document.querySelector('#b1').addEventListener('click', function () {
        setState1(state1.value + 1)
        setTimeout(()=>{
            this.textContent = `Clicks (${state1.value})`
        }, 100)
    });
}

{
    const [state2, setState2] = Hooks.useState(1, onStateChange)
    document.querySelector('#b2').addEventListener('click', function () {
        setState2((old) => {
            return old * 2
        })
        setTimeout(()=>{
            this.textContent = `Clicks (${state2.value})`
        }, 100)
    });
}

useEvent

This hook is designed to trigger the effect under certain conditions:

• load - perform the effect when the element appears in the document
• viewport - perform the effect when the element appears in the viewport
• attribute - perform the effect when the element attribute(s) changed
• children - perform the effect when the element children changed (add or remove)
• data - perform the effect when the element text content was changed

import { useEvent, EVENTS } from "@olton/hooks"

useEvent({
    target: "#btn",
    event: EVENTS.VIEWPORT,
    effect: (target) => console.log(`Element showing in viewport`)
})

useMemo

Do memoization with hook useMemo. You can pass function as argument to useMemo and return memoized function.

import {useMemo} from "@olton/hooks"

const factorial = Hooks.useMemo( n => {
    return n <= 1 ? 1 : n * factorial(n-1)
})

console.log(factorial(5)) // calc
console.log(factorial(5)) // use cache for 1!, 2!, 3!, 4!, 5!

usePipe

import {usePipe} from "@olton/hooks"

const fn1 = v => v + " world!"
const fn2 = v => v + " usePipe()"
const fn3 = v => v + " Enjoy!"

const pipeResult = Hooks.usePipe(fn1, fn2, fn3)("Hello")

console.log(pipeResult)
// --> Hello world! usePipe() Enjoy!

useDebounce

useThrottle

useCompose

useCurry