JavaScript string won't match, even if it is matching

Question

So I have a short question: I'm reading data from a file, that works. I'm adding these data to a string, that's ok.

But when it comes to comparing these data on an if-statement it doesn't simply become true.

I've done console.log of the string, and it appears correct:

["A", "B", "C", "D", "E"]

I've tried to rewrite the data, I've checked for syntax errors on the text file, but everything looks correct.

for (var i = 0; i < lineArray.length; i++) {
        var singleLine= lineArray[i].split(' ');
        console.log(singleLine) //And I get the array ["A", "B", "C", "D", "E"]
          if (singleLine[4] === 'E') {
             console.log("it works")
   }
}

The thing I'm expecting to happen is to get the 'it works' on the console.

There must be something else there in `singleLine[4]`. Have you tried adding `console.log(singleLine[4].length)`? — Pointy, Jun 08 '19 at 11:51
Since you are reading from a file - could it be the encoding thats causing the inequality? — BroBan, Jun 08 '19 at 11:53
Add what object you are getting as singleLine, not console log but actual object — Ganesh Karewad, Jun 08 '19 at 11:54
Unrelated to your problem, you should use let/const rather than var if you can. — jarmod, Jun 08 '19 at 11:55
What is `lineArray` and `lineArr`? Please provide input examples. — Hensler Software, Jun 08 '19 at 11:58
You can console.log(singleLine[4], 'E') to see if there's a difference — Avin Kavish, Jun 08 '19 at 12:09
@Pointy sorry for late reply! The length of the elements are always +1 for the last element on the line. For example the length of the 'E' is 2. — MZ97, Jun 17 '19 at 13:25
@MZ97 well that means there's some additional character in the string. You can use `.charCodeAt()` to check the Unicode numeric value for each part of the string. — Pointy, Jun 17 '19 at 13:30
@BroBan I think every last element on every line is having a kind of new-line (\n), but that is invisible. I have tried to compare it with 'E\n' or 'E \n'. But no success — MZ97, Jun 17 '19 at 13:34
@Pointy I get that the second char is 13. Any idea what that is? — MZ97, Jun 17 '19 at 13:37
That's a "carriage return" character, picked up from the original file probably. — Pointy, Jun 17 '19 at 13:39
@Pointy Thank you so much for your help! The solution was to compare it with 'E\r'. I'll soon be answering the question on my own here. — MZ97, Jun 17 '19 at 13:42

settah abdelkader · Answer 1 · 2019-06-08T12:55:54.890

0

let lineArray = ["A", "B", "C", "D", "E"];

lineArray.forEach(a => {
        console.log(a); 
    if (a ==="E") console.log("its work")
    })

edited Jun 08 '19 at 12:55

answered Jun 08 '19 at 12:44

settah abdelkader

22
3

score 0 · Accepted Answer · answered Jun 17 '19 at 13:52

0

The problem on this case was the invisible 'Carriage Return' or '\r' on every last element of every line.

The solution on my case was to compare the letter E with 'E\r'. This will result on the if-statement to be true.

answered Jun 17 '19 at 13:52

MZ97

201
1
11

JavaScript string won't match, even if it is matching

2 Answers2