Create a function to convert 'M/D/YYYY' date to 'YYYYMMDD' date in JS-CodePudding

This is a practice interview question related to JS I found online. I have tried to complete it and added code below. My question is would my code be a acceptable answer to the question: Create a function to convert a 'M/D/YYYY' formatted date to a 'YYYYMMDD' formatted date in JS?

function formattedUserDate(userInput) {
    const formatDate = userInput
    const apiDateForm = formatDate.split('/')
    let formatDateMonth = apiDateForm[0]
    let formatDateDay = apiDateForm[1]
    let formatDateYear = apiDateForm[2]
    
    formatDateMonth.length == 1 ? formatDateMonth = '0'   formatDateMonth : null;
    formatDateDay.length == 1 ? formatDateDay = '0'   formatDateDay : null;

    const apiDateFormArray = [formatDateYear, formatDateMonth, formatDateDay];
    return apiDateFormArray.join('');
}

console.log(formattedUserDate('5/1/1987'));

CodePudding user response：

function formattedUserDate(userInput) {
  const apiDateForm = userInput.split('/')
  let formatDateMonth = `0${apiDateForm[0]}`.slice(-2);
  let formatDateDay = `0${apiDateForm[1]}`.slice(-2);
  let formatDateYear = apiDateForm[2]
  const apiDateFormArray = [formatDateYear, formatDateMonth, formatDateDay];
  return console.log(apiDateFormArray.join(''));
}

formattedUserDate('5/1/1987')

CodePudding user response：

In Javascript have new method padStart and padEnd has below syntax.

"your_string".padStart(targetLength [,padString]):

function formattedUserDate(userInput) {
    const formatDate = userInput
    const apiDateForm = formatDate.split('/')
    let formatDateMonth = apiDateForm[0]
    let formatDateDay = apiDateForm[1]
    let formatDateYear = apiDateForm[2]
    
    formatDateMonth = formatDateMonth.padStart(2, "0")
    formatDateDay = formatDateDay.padStart(2, "0")
    
    const apiDateFormArray = [formatDateYear, formatDateMonth, formatDateDay];
    return console.log(apiDateFormArray.join(''));
}

formattedUserDate('5/1/1987');

CodePudding user response：

I think that may be a correct answer. But your code must be clean and clear like that :)

function formattedUserDate(userInput) {

         const date = userInput.split("/");

         let day   = date[1],
             month = date[0], 
             year  = date[2];
        
         return (year   formatter(month)   formatter(day));
}
        
        
const formatter = text => text < 10 ? ('0'   text) : text;
        

console.log("date formatted : "   formattedUserDate('5/1/1987'))