Home/ Questions/The best way to fix the uncaught typeerror: cannot read property '0' of undefined error
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Zia Miller
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Asked: 2022-05-18T20:25:39+00:00 In:

The best way to fix the uncaught typeerror: cannot read property ‘0’ of undefined error

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Hi developer experts, I have a small but frustrating use case, and so far, I couldn’t get my head around this problem & ideal solution. I am running my command and facing one problem with the uncaught typeerror: cannot read property ‘0’ of undefined. Below is the command I used:

var words = [];
function addLetter(letter,d){
 var ascii = letter.charCodeAt(0)-97;
 if(!hasLetter(letter,d)){
  document.write("This letter" + letter + " hasn't been found in words.");
  d[ascii] = new Node(letter);
 }
  document.write("This letter " + letter + " already exists in words.");
  document.write(d[ascii].letter);
addLetter("a",words);

When I run it, I get the following error:

Uncaught TypeError: Cannot read property '0' of undefined

I am looking forward to gaining some knowledge from all experts. Thank you, guys!

cannot read property 0 of undefined
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2 Answers

  1. Best Answer
    Expert

    The cause: Instead of sending the array, you are only passing the first word. The uncaught typeerror: cannot read property ‘0’ of undefined appears. The error at:

    hasLetter("a",words[]);

    Solution: As an alternative, give the function the array to fix the issue.

    hasLetter("a",words);
    • 0

  2. Your code is error-free

    But I call the hasLetter method as follows: 

    hasLetter("a",words);
    • 5

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