Michele Cassano mic-css
mic-css
/ useIsMounted.ts
Last active
April 14, 2020 11:33
Custom hook that keeps track of whether a component is mounted, useful for canceling asynchronous setStates
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| import { useRef, useEffect } from 'react' | |
| export const useIsMounted = () => { | |
| const isMounted = useRef(false) | |
| useEffect(() => { | |
| isMounted.current = true | |
| return () => { | |
| isMounted.current = false |
mic-css
/ usePrevious.ts
Last active
May 6, 2020 10:22
Custom hook that keeps track of the previous value of an object or primitive, useful for comparing props between renders
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| import { useEffect, useRef } from 'react' | |
| export function usePrevious<T>(value: T) { | |
| const ref = useRef<T>() | |
| useEffect(() => { | |
| ref.current = value | |
| }) | |
| return ref.current |
mic-css
/ asyncWrap.ts
Last active
May 6, 2020 10:26
Custom wrapper function for destructuring asynchronous requests into loading, error and result states
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| export const asyncWrap = (promise: Promise<any>) => | |
| promise | |
| .then(result => [false, null, result]) | |
| .catch(err => [false, err, null]) | |
| // Usage | |
| const [isLoading = true, err, result] = asyncWrap(asynchronousTask()) |