Reversing a string in JavaScript

Question

I\'m trying to reverse an input string

var oneway = document.getElementById(\'input_field\').value();
var backway = oneway.reverse();

but f

Answer 1

If it's necessary to revert the string, but return the original value of the error:

function reverseString(s) {
    let valuePrintS;
    try {
        valuePrintS = s.split("").reverse().join("");    
    } catch {
        console.log("s.split is not a function");
        valuePrintS = s;
    } finally {
        console.log(valuePrintS);
    }
}

Answer 2

String.prototype.strReverse = function() {

    var newstring = "";

    for (var s=0; s < this.length; s++) {
        newstring = this.charAt(s) + newstring;
    }

    return newstring;
};

Answer 3

reverse is a function on an array and that is a string. You could explode the string into an array and then reverse it and then combine it back together though.

var str     = '0123456789';
var rev_str = str.split('').reverse().join('');

Answer 4

reverse() is a method of array instances. It won't directly work on a string. You should first split the characters of the string into an array, reverse the array and then join back into a string:

var backway = oneway.split("").reverse().join("");

Update

The method above is only safe for "regular" strings. Please see comment by Mathias Bynens below and also his answer for a safe reverse method.

Answer 5

Google harder, bros. This is by Edd Mann.

function reverse (s) {
for (var i = s.length - 1, o = ''; i >= 0; o += s[i--]) { }
return o;
}

http://eddmann.com/posts/ten-ways-to-reverse-a-string-in-javascript/

http://jsperf.com/string-reverse-function-performance

Answer 6

This is probably the way, acceptable for all browsers:

function reverse(s) {
  var o = '';
  for (var i = s.length - 1; i >= 0; i--)
    o += s[i];
  return o;
}

Call it like a charm:

reverse('your_string');