JSFiddle - React, Tailwind, and code Playground

by Sunny SM

JavaScript

const isEmpty = value => value === undefined || value === null || value === '';

function integer(value) { // eslint-disable-line
  if (!isEmpty(value) && !Number.isInteger(Number(value))) {
    return { flag: true, message: 'Must be a number' };
  }
  return { flag: false };
} 
const ss = '5241';
console.log('Result', integer(ss))