Question: I have a table calculated using a df which looks like the following.

```
 Month_considered   pct `ATC Count`
   <fct>            <dbl> <fct>      
 1 Apr-17            54.9 198,337    
 2 May-17            56.4 227,681    
 3 Jun-17            58.0 251,664    
 4 Jul-17            57.7 251,934    
 5 Aug-17            55.5 259,617    
 6 Sep-17            55.7 245,588    
 7 Oct-17            56.6 247,051    
 8 Nov-17            57.6 256,375    
 9 Dec-17            56.9 277,784    
10 Jan-18            56.7 272,818  

```

Now I want to find the difference in pct between two months.So the desired output would be like

```
 Month_considered          pct 
   <fct>                   <dbl>    
 1 Apr-17-May-17            1.5    
 2 May-17-Jun-17            1.6   
 3 Jun-17-Jul-17           - 0.3  

```

How do I concatenate the first column like above. I did try using `unite` in `tidyr` but it isnt the output what I want to generate.Thank you.

Answer: 
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> npm view react-native version
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You can check the latest version of react native. You can run it under the root of your project or everywhere. Of course, you will need internet connection to check latest version.

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> react-native -v
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If you run under the root of project, it will return the version of two npm packages, **react-native-cli** and r**eact-native**. Those versions are using in your project.
Macbook M1 Chip

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> npm view react-native version
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