Replace for loop with For... of

Lines 40 to 41 in a648aa2

    
           for (i = 0; i < validURLs.length; i++) { 
        
               checkURL(validURLs[i]);

There's a new way to iterate through the list that will make sure you're never out of range or have to worry about the element number

You can change it to something like below

for (const url of validUrls) {
  checkUrl(url)
}

	for (i = 0; i < validURLs.length; i++) {
	checkURL(validURLs[i]);