Question

How to swap every two characters (pairs) in a string with JavaScript

Answer 1

String.prototype.replaceAt=function(index, ch) {
    return this.substr(0, index) + ch + this.substr(index + ch.length);
}

function swap(s, index1, index2) {
    var tmp = s[index1];
    s = s.replaceAt(index1, s[index2]);
    s = s.replaceAt(index2, tmp);
    
    return s;
}

    
s = "abcdef"; 

for (var i = 0; i < s.length; i++) {
     if (i % 2 === 0) {
         if ((i + 1) < s.length) {
             s = swap(s, i, i + 1);
         }
     }
}
 
document.write(s);  
  
 
 
/*
run:
     
badcfe 
     
*/

 

70+ SQL courses for beginners and professionals