react-js-cron-mui/src/utils.ts

A React cron editor with Material UI a forked repo from Xavier Rutayisire (https://github.com/xrutayisire/react-js-cron)

import { useRef, useEffect } from 'react'

import { Classes, OnError, Locale } from './types'
import { DEFAULT_LOCALE_EN } from './locale'

/**
 * Creates an array of integers from start to end, inclusive
 */
export function range(start: number, end: number) {
  const array: number[] = []

  for (let i = start; i <= end; i++) {
    array.push(i)
  }

  return array
}

/**
 * Sorts an array of numbers
 */
export function sort(array: number[]) {
  array.sort(function (a, b) {
    return a - b
  })

  return array
}

/**
 * Removes duplicate entries from an array
 */
export function dedup(array: number[]) {
  const result: number[] = []

  array.forEach(function (i) {
    if (result.indexOf(i) < 0) {
      result.push(i)
    }
  })

  return result
}

/**
 * Simple classNames util function to prevent adding external library 'classnames'
 */
export function classNames(classes: Classes) {
  return Object.entries(classes)
    .filter(([key, value]) => key && value)
    .map(([key]) => key)
    .join(' ')
}

/**
 * Handle onError prop to set the error
 */
export function setError(onError: OnError, locale: Locale) {
  onError &&
    onError({
      type: 'invalid_cron',
      description:
        locale.errorInvalidCron || DEFAULT_LOCALE_EN.errorInvalidCron,
    })
}

/**
 * React useEffect hook to return the previous value
 */
export function usePrevious(value: any) {
  const ref = useRef(value)

  useEffect(() => {
    ref.current = value
  }, [value])

  return ref.current
}