Reverse the String in JavaScript

Question

I want to convert the string "19-12-2018" to "2018-12-19" How can I do it?

var str = "19-12-2018";
    str.split('').reverse().join('')  //returns 8102-21-91"

how to do this?

Answer 1

var str = "19-12-2018";
var newstr = str.split('-').reverse().join('-');
console.log(newstr);

Answer 2

Do split('-') first:

var str = "19-12-2018";
str = str.split('-').reverse().join('-');
console.log(str);

Answer 3

You need this:

str.split('-').reverse().join('-')

Answer 4

I call the split function passing dash which separate each part of the string

str.split("-").reverse().join("-");

Description of functions used

1. String.prototype.split(): The split() method turns a String into an array of strings, by separating the string at each instance of a specified separator string.

const chaine = "Text";
console.log(chaine.split('')); // output ["T", "e", "x", "t"]

2. Array.prototype.reverse(): The reverse() method reverses an array in place. The first array element becomes the last, and the last array element becomes the first.

const characters = ["T", "e", "x", "t"];
console.log(characters.reverse()); // output ["t", "x", "e", "T"]

3. Array.prototype.join(): The join() method creates and returns a new string by concatenating all of the elements in an array

const reverseCharacters = ["t", "x", "e", "T"];
console.log(reverseCharacters.join('')); // output "txeT"

Answer 5

Try this one

var str = "19-12-2018".split('-');
var newstr=str[2]+"-"+str[1]+"-"+str[0];