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this is one of the most common questions I get on all of my JavaScript videos and thatamp;#39;s why do I have these extra commas at the end of my rays and my objects so this is known as a trailing comma and while it might seem subtle and it is it actually has an important use case so for example if we had no comma here and I wanted to add a value what do I have to do weamp;#39;ll have to add the comma in and then I add the next value and then I would push this into git and whatamp;#39;s going to happen when I make this git commit well the commit is going to show that I added a line and I edited this slide and that just muddies up the git history a little bit because I didnamp;#39;t really edit this line all I needed to do was add a comma and then if somebody in the future realizes thereamp;#39;s a bug with this line theyamp;#39;re going to look to the git history and the get blame and theyamp;#39;re going to see the last time this line was changed and itamp;#39;s just going to