Why the console log is equal to results, but it doesn't work?

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

function truncateString(str, num) {
let new_str = str.substr(str, num)
console.log(new_str + "...")
return new_str;
}

truncateString("A-tisket a-tasket A green and yellow basket", 8);
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Challenge: Truncate a String

Link to the challenge:

Run a length count on your string vs the correct string.
You will likely find they are different lengths.
This often happens when a user formats code differently than expected!
(Happens to us all).

you are not changing new_str at all with this,

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