Creating a custom array within an array sort function in Javascript -

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In order to sort arrays to the custom sort function, I have to enter in the SortIP function. This does not work from the last digit of the number. 

  function ccupi (A, B) {back [0] [3] - B [0] [3]; } "Network switch", ["ADSL router", [192, 168, 0, 1]], ["Gary Mack", [192, 168, 0, 15]], [192, 168, 0, 2]], ["production email", [192, 168, 0, 60]]); LAN.sort (SortIP);   
  •  Network Switch: 192.168.0.2  
  •  Gary Mack: 192.168.0.15  
  •  Product Email: 192.168.0.60   
     
     
     you are almost there  
     just replaced  
      back [0] [3] - b [0] [3];   
     with 
     
      back [1] [3] - b [1] [3];  
     
     And you are 
     
     Why? Because IP is the second (index = 1) cell of each array.

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