Reverse a String | Basic Scripting

I am getting reference error, that aString is not found. I don’t understand the error and the reason why test is failing.

function reverseString(str) {
 let String = "";
 for (let i = str.length; i >= 0; i-- ){
let aString = String + str[i];

  return aString;


problem link -

Thanks : )


  1. the last index of the char in the string is not equal to str.length
  1. variables declared with let are “block-scoped”. They can’t be seen outside the block.
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Got!! Thank you @udaaff :star2:

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