What is the best way to display every comment and response using console.log()?

Currently, I am developing a commenting system where users can leave comments and reply to existing comments. In the MySQL database image

Both images depict the same scenario. In my highlighted text in yellow, it should read comments[0] instead of comment[0] and the same applies to others as well.

If you are curious, in the lower image...

reply_id being Null indicates that the comment has no replies.

parent_comment_id: corresponds to the comment_id. This signifies that the reply_comment is in response to the comment with that specific comment_id. Apologies for the confusing explanation.

=========What I am aiming for===========

Initial comment.

I have replied to the initial comment.

This is my second response.

Hey...

You got owned, buddy.

My Attempt. It's not functioning. I struggle with JavaScript. I am encountering an "comment is not defined" error. My approach may be flawed, but it provides an insight into what I am attempting to achieve

 for(var i = 0; i < comments[0].length; i++) { 
     if(comments[0][i].reply_comment && comments[0][i].comment == comments[0][i+1].comment || comments[0][i].comment != comments[0][i-1].comment ) { 
         console.log(comments[0][i].comment) 
         console.log(comments[0][i].reply_comment)
     } 
     else {
        console.log(comments[0][i].reply_comment)
     } 
}
javascriptarraysif-statement

Answer №1

The person who originally posted this may have already resolved the issue. I am sharing this answer to assist those who are currently viewing this question.
Within this code, it appears that you have overlooked checking the existence of both the comments[0][i-1] and comments[0][i+1] array items.
In cases where i=0, attempting to retrieve the comment from the non-existent comments[0][-1] array item as 

comments[0][i-1]</code will certainly lead to errors.<br />
Similarly, in instances where the array length is <code>5
, with i=4, you will be trying to access the comment property from a nonexistent comments[0][5] as 
comments[0][i+1]</code.<br />
To address such issues, it is important to first check the existence of the array item as demonstrated below.<br />
I have implemented a check for the existence of the <code>comments[0][i]
element to ensure that it is defined before usage. If you are confident in its existence, you can bypass this check.

for(var i = 0; i < comments[0].length; i++) { 
     if(comments[0][i] && comments[0][i+1] && comments[0][i-1] &&
        comments[0][i].reply_comment && 
        comments[0][i].comment == comments[0][i+1].comment || 
        comments[0][i].comment != comments[0][i-1].comment ) { 
         console.log(comments[0][i].comment); 
         console.log(comments[0][i].reply_comment);
     } 
     else {
        console.log(comments[0][i].reply_comment);
     } 
}

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