Please tell me why this is returning false

 var str = "-1 (757) 622-7382";
 console.log((isNaN(str.substring(1,0) && str.substring(1,0) != "(")));
// The console.log above returns false while the two seperate statements below return true and I have no idea why :(
  console.log(str.substring(1,0) != "(")

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

Check your parentheses.

You have this:

console.log((isNaN(str.substring(1,0) && str.substring(1,0) != "(")));

Should be:

console.log(isNaN(str.substring(1,0)) && str.substring(1,0) != "(");


console.log((isNaN(str.substring(1,0)) && str.substring(1,0) != "("));
1 Like

Thank you so much I was stuck on it for ages

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