tungvn

import React from 'react'
import debounce from 'lodash/debounce' // Or throttle

export const HelloWorld: React.FC = () => {
  // Example for a state can change quickly in a bit of time
  const [innerParams, setInnerParams] = React.useState<string>('')

  // Use ref to create a freeze debounce function to make sure it's not rerender
  // Need to pass the changing parameters here
  const fetch = React.useRef(debounce((params: any) => {

tungvn

/*
Before Septemper 15 2018, Vietnam has phone number start with 09*, 01(2|6|8|9).
After that, the phone number can start with 03, 05, 07 or 08.
So this function provide a way to validate the input number is a Vietnamese phone number
*/

function isVietnamesePhoneNumber(number) {
  return /(03|05|07|08|09|01[2|6|8|9])+([0-9]{8})\b/.test(number);
}