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Increment localStorage value by one

I am working on an attempted log in feature to our application. They fail three times it kicks them out altogether. To keep count of how many times they attempt I thought I would use localStorage because I can easily manipulate it. However, I am having trouble incrementing the value when they fail to authenticate themselves.

At the top, I am setting the localStorage variable

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and then if the server returns an error, I am trying to increment that value.

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and obviously this is not working, but all I can find when I research is setting and getting the localStorage nothing about updating or changing. Any help would be wonderful!

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Answer

And in some cases you have to add ++ before attempts:

JavaScript
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