assert(JSON.stringify(searchForMatches(searchData,['cats']))==='["catcode.io","catgifs.co"]',"The result should be '[\"catcode.io\",\"catgifs.co\"]'");
Why do I need the use of \ at the end multiple times? It throws an error otherwise. Is it specific to JSON.stringify and/or when/how should I go about about using it in future instances?
\ is an escape operator. It prevents the language from parsing the next char as syntax relevant, so without it your string stops at the next " after the first " which starts the string.
The backslash is a JavaScript operator used within a string for escaping a special character. In your case it is escaping a quotation. See this example:
// in this case it escapes the " symbol because that would end the string.
var x = "\"";
This is the same as:
// in this case you don't need to escape it because
// the string begins with the apostrophe instead of the " character
var x = '"';
In both cases console.log(x); will print a single quote character.
