.length not working

JavaScript
1

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);
 console.log(newStr);
 let strLength=[];

 for(let i =0; i <=str.length; i++){
   console.log(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:

2

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

3

TypeError: Cannot read property ‘length’ of undefined

4

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

5

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

6

the length of str[i] is always 1

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

7

Yes there is an edit.

Check this line:

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

  console.log(i)

  strLength = newStr[i].length;

}

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

[ ‘The’,
‘quick’,
‘brown’,
‘fox’,
‘jumped’,
‘over’,
‘the’,
‘lazy’,
‘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

newStr[i].length

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

TypeError: Cannot read property ‘length’ of undefined

8

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

9

not the strings, i need string length

10

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

11

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

12

try inside the loop

console.log(newStr[i])
console.log(newStr[i].length)

and look at where the error appear

13

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

14

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

15

Yes now its working Thank you

16

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

1 Like
17

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