Why can't I swap characters in a javascript string?

Question

I am trying to swap first and last characters of array.But javascript is not letting me swap. I don\'t want to use any built in function.

function swap(arr         


        

Answer 1

Let me offer my side of what I understood: swapping items of an array could be something like:

var myFish = ["angel", "clown", "mandarin", "surgeon"];
var popped = myFish.pop();
myFish.unshift(popped) // results in ["surgeon", "angel", "clown", "mandarin"]

Regarding swaping first and last letters of an strings could be done using Regular Expression using something like:

"mandarin".replace(/^(\w)(.*)(\w)$/,"$3$2$1")// outputs nandarim ==> m is last character and n is first letter