.length not working

Tell us what’s happening:

The .length on index is not working inside the loop.
Is that normal?

Your code so far

function findLongestWordLength(str) {

 let theRegex = /\S+/g;
 let newStr = str.match(theRegex);
 let strLength=[];

 for(let i =0; i <=str.length; i++){
   strLength = str[i].length;
return str.length;


findLongestWordLength("The quick brown fox jumped over the lazy dog");

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36.

Challenge: Find the Longest Word in a String

Link to the challenge:

what do you see to say that it doesn’t work?

TypeError: Cannot read property ‘length’ of undefined

instead of console.log(i) try to do console.log(str[i]) - do you see the expected values?

that’s working, but i need the length of items inside the array.

this line is not working :

`strLength = str[i].length;

TypeError: Cannot read property ‘length’ of undefined

the length of str[i] is always 1

what’s your array? are you sure you are iterating over it?

Yes there is an edit.

Check this line:

for(let i =0; i <=newStr.length; i++){


  strLength = newStr[i].length;


newStr is the array created by the regex;
Like this:

[ ‘The’,
‘dog’ ]

and console.log(i) gives the 0-9(the number of words)
so i need the length of each word by newStr[index].length


but the while consoling the newStr[i].length give

TypeError: Cannot read property ‘length’ of undefined

now try again with console.log(newStr[i]) inside the loop, do you have the values you expect?

not the strings, i need string length

please do this check and look at what appears in the console

i done that. It gives the words. I wish to get 3 on the first word " The " while console.log(newStr[0].length);

try inside the loop


and look at where the error appear

console.log(newStr[0].length) works out side the loop perfectly.
but that not showing any results inside the loop.

what’s your current code?
what’s appearing in the console?

Yes now its working Thank you

i <= str.length your last loop access to str[i] is undefined, so you get that error.

1 Like

Yea looks good I dont know y it doesn’t work