Yes, you may put comments in there. They however must start at the beginning of a line.

cf. http://git-scm.com/book/en/Git-Basics-Recording-Changes-to-the-Repository#Ignoring-Files

&gt; The rules for the patterns you can put in the .gitignore file are as follows:  
- Blank lines or lines starting with # are ignored.  
[…]

The comment character is `#`, example:

    # no .a files
    *.a

Do `git help gitignore`

You will get the help page with following line:

    A line starting with # serves as a comment.

Assuming I have the following:

    var array = 
        [
            {&quot;name&quot;:&quot;Joe&quot;, &quot;age&quot;:17}, 
            {&quot;name&quot;:&quot;Bob&quot;, &quot;age&quot;:17}, 
            {&quot;name&quot;:&quot;Carl&quot;, &quot;age&quot;: 35}
        ]

What is the best way to be able to get an array of all of the distinct ages such that I get an result array of:

    [17, 35]

Is there some way I could alternatively structure the data or better method such that I would not have to iterate through each array checking the value of &quot;age&quot; and check against another array for its existence, and add it if not?

If there was some way I could just pull out the distinct ages without iterating...

Current inefficent way I would like to improve... If it means that instead of &quot;array&quot; being an array of objects, but a &quot;map&quot; of objects with some unique key (i.e. &quot;1,2,3&quot;) that would be okay too. Im just looking for the most performance efficient way.

The following is how I currently do it, but for me, iteration appears to just be crummy for efficiency even though it does work...

    var distinct = []
    for (var i = 0; i &lt; array.length; i++)
       if (array[i].age not in distinct)
          distinct.push(array[i].age)

How to get distinct values from an array of objects in JavaScript?

I have a table which I want to get the latest entry for each group. Here&#39;s the table:

`DocumentStatusLogs` Table

    |ID| DocumentID | Status | DateCreated |
    | 2| 1          | S1     | 7/29/2011   |
    | 3| 1          | S2     | 7/30/2011   |
    | 6| 1          | S1     | 8/02/2011   |
    | 1| 2          | S1     | 7/28/2011   |
    | 4| 2          | S2     | 7/30/2011   |
    | 5| 2          | S3     | 8/01/2011   |
    | 6| 3          | S1     | 8/02/2011   |
    
The table will be grouped by `DocumentID` and sorted by `DateCreated` in descending order. For each `DocumentID`, I want to get the latest status. 

My preferred output:

    | DocumentID | Status | DateCreated |
    | 1          | S1     | 8/02/2011   |
    | 2          | S3     | 8/01/2011   |
    | 3          | S1     | 8/02/2011   |

- Is there any aggregate function to get only the top from each group? See pseudo-code `GetOnlyTheTop` below:

   

        SELECT
          DocumentID,
          GetOnlyTheTop(Status),
          GetOnlyTheTop(DateCreated)
        FROM DocumentStatusLogs
        GROUP BY DocumentID
        ORDER BY DateCreated DESC

- If such function doesn&#39;t exist, is there any way I can achieve the output I want?
- Or at the first place, could this be caused by unnormalized database? I&#39;m thinking, since what I&#39;m looking for is just one row, should that `status` also be located in the parent table?

Please see the parent table for more information:

Current `Documents` Table

    | DocumentID | Title  | Content  | DateCreated |
    | 1          | TitleA | ...      | ...         |
    | 2          | TitleB | ...      | ...         |
    | 3          | TitleC | ...      | ...         |

Should the parent table be like this so that I can easily access its status?

    | DocumentID | Title  | Content  | DateCreated | CurrentStatus |
    | 1          | TitleA | ...      | ...         | s1            |
    | 2          | TitleB | ...      | ...         | s3            |
    | 3          | TitleC | ...      | ...         | s1            |

**UPDATE**
I just learned how to use &quot;apply&quot; which makes it easier to address such problems.


Get top 1 row of each group

Can you write comments in a `.gitignore` file?

If so, should the line be preceded with a `#` or some other indicator?

Comments in .gitignore?

<p>Can you write comments in a <code>.gitignore</code> file?</p>
<p>If so, should the line be preceded with a <code>#</code> or some other indicator?</p>


Is there a way to push all my local commits to the remote repository *except the most recent one*? I&#39;d like to keep the last one locally just in case I need to do an amend.

git push: Push all commits except the last one

I want the output of `git status` to be returned in a `less`-like environment. This already works for `git diff`, but not `git status`. I already tried adding the following to `~/.gitconfig`, but it didn&#39;t work:

    [core]
      pager = less

What am I missing? Thanks.

How can I turn on a pager for the output of git status?

I did a commit and reverted with 

    git revert HEAD^

just git log

    ➜  git:(master) git log
    commit 45a0b1371e4705c4f875141232d7a97351f0ed8b
    Author: Daniel Palacio &lt;danpal@gmail.com&gt;
    Date:   Tue Jan 17 16:32:15 2012 -0800
    
        Production explanation


But if I do git log --all it still show up. I need to remove it from the history as it has sensitive information


    git log --all
    commit 5d44355080500ee6518f157c084f519da47b9391
    Author: Daniel Palacio
    Date:   Tue Jan 17 16:40:48 2012 -0800
    
        This commit has to be reset
    
    commit 45a0b1371e4705c4f875141232d7a97351f0ed8b
    Author: Daniel Palacio 
    Date:   Tue Jan 17 16:32:15 2012 -0800
    
        Production explanation



How do I remove the commit 5d44355080500ee6518f157c084f519da47b9391 from the history too?

How to revert last commit and remove it from history?

I&#39;ve run into a problem with git. Basically I set to false `core.ignorecase` because I wanted to change the case of the names of some folders (since I&#39;m under OSX with a case-insensitive filesystem, the changes weren&#39;t shown otherwise). When I pulled my data, I&#39;ve noticed that now every renamed folder appears twice on the repository, with both the old and the new name. I don&#39;t know what to do to remove the old folders since they don&#39;t appear locally (I&#39;ve try to set `core.ignorecase` to true again but it isn&#39;t helping).

Case sensitivity in Git

I have started working on a project and I made some unwanted commits which I pushed to origin master. Now, when I try to do a pull request, Github wants to commit all of the previous commits. 

My question is, how do I remove the unwanted commits and commit the changes that I want to commit so that I am up to date with master? 



Git Remove unwanted commits from a Pull Request

I have never, ever, seen a PHP file using hashes (`#`) for commenting. But today I realized that I actually can! I&#39;m assuming there&#39;s a reason why everybody uses `//` instead though, so here I am.

**Is there any reason, aside from personal preference, to use `//` rather than `#` for comments?**


Can I use a hash sign (#) for commenting in PHP?

I want to add comment in SQL code. How can I do this? I&#39;m using MySQL.

How can I add comments in MySQL?

&gt; **Possible Duplicate:**  
&gt; [R: Multiline Comment Workarounds?](https://stackoverflow.com/questions/1231195/r-multiline-comment-workarounds)  

&lt;!-- End of automatically inserted text --&gt;

I want to comment out several lines of code in R. Is there any way of doing it without having to put a # before each line - sort of like `/* blocked out code */` in SAS?

R: Comment out block of code

I&#39;d like to add comments for a few packages in a pip requirements file. (Just to explain why that package is on the list.) Can I do this?

I&#39;m imagining something like

&lt;pre&gt;&lt;code&gt;Babel==0.9.5 # translation
CherryPy==3.2.0 # web server
Creoleparser==0.7.1 # wiki formatting
Genshi==0.5.1 # templating
&lt;/code&gt;&lt;/pre&gt;

Can I add comments to a pip requirements file?

I know how to write a multi-line command in a Bash script, but how can I add a comment for each line in a multiline command?

    CommandName InputFiles      \ # This is the comment for the 1st line
                --option1 arg1  \ # This is the comment for the 2nd line
                --option2 arg2    # This is the comment for the 3nd line

But unfortunately, the comment after continuation character `\` will break the command.



How to put a line comment for a multi-line command

Is there a way to have a `git ignore file` to ignore all files with the name test in them?

I have files like this:

     - css/test.css 
     - js/subfolder/test.js 
     - lib/main/sub/test.html

and so on.

I want `git` to avoid adding or committing any files with the name test.


Ignore all files with the same name in git

I have created a white-list for text files only.

    *
    !*.txt

Now, I have an untracked text file in a sub-directory - `sub/dir/file.txt`, and this is NOT shown (it is ignored). Text files in the root directory are shown, however.

Why is that, and how do I fix it?


Whitelisting and subdirectories in Git

I have a git repository that is ignoring image files as well as a few other files, but my `.gitignore` file only has it ignoring a `config.php` file.  Is there some global ignore file somewhere that I can&#39;t seem to find?  I have to specify files to add them now, and it&#39;s giving me this warning:

&gt; The following paths are ignored by one of your .gitignore files.

The contents of my `~/.gitconfig` file are only my e-mail address.

Git is ignoring files that aren&#39;t in gitignore

I have a Bitbucket Git repository managed with Sourcetree.

I have two folders that I want to commit, but I need to ignore all the files in these folders, because they contain only temporary files.

How can I do that?


How do I ignore all files in a folder with a Git repository in Sourcetree?

I want git to ignore my `UserInterfaceState.xcuserstate` file in my XCode4 project, but where should I put the `.gitignore` file?, is it inside the `.git` folder? or out? The `.git` is in same folder with the `ProjectName.xcodeproj` file

Content Type	Original Author	Original Content on Stackoverflow
Question	James Raitsev	View Question on Stackoverflow
Solution 1 - Git	TimWolla	View Answer on Stackoverflow
Solution 2 - Git	manojlds	View Answer on Stackoverflow

Comments in .gitignore?

Git Problem Overview

Git Solutions

Solution 1 - Git

Solution 2 - Git

Get top 1 row of each group

How to get distinct values from an array of objects in JavaScript?

Attributions