Question

How to reverse a string without affecting special characters in Node.js

Answer 1

function swap(str, left, right) {
    let arr = str.split('');
     
    let tmp = arr[left];
    arr[left] = arr[right];
    arr[right] = tmp;
     
    return arr.join('');
}
 
function reverseStringWithoutTheSpecialCharacters(str) {
    let right = str.length - 1;
    let left = 0;
     
    while (left < right) {
        if (!(/[a-zA-Z]/).test(str[left])) {
            left++;
        }
        else if (!(/[a-zA-Z]/).test(str[right])) {
            right--;
        }
        else {
            str = swap(str, left, right);
 
            left++;
            right--;
        }
    }
    return str;
}
         
let str = "ab*#cde!@$,fg{}hi&";
 
str = reverseStringWithoutTheSpecialCharacters(str);
 
console.log(str);
 
 
   
   
/*
run:
   
ih*#gfe!@$,dc{}ba&
   
*/

 

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