How to simplify the condition for the paginator?

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  https://repl.it/@fomenkogregory/Paginator-5#src/App .js
  
  I created such a paginator, how to simplify the condition without changing the behavior? Help.

  JavaScript Elliot Small, Feb 12, 2019

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1 Answers
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  Let's put in separate variables the conditions that determine whether it is necessary to show groups of buttons that ...
  
  
  
  

  // ...прилегают к первой кнопке
  
  const showAfterFirst = currentPage < 5;
  
  
  
  // ...прилегают к последней кнопке
  
  const showBeforeLast = currentPage > totalPages - 4;

  
  
  Accordingly, the conditions for displaying ellipsis after / before the first / last buttons will be reversed values: ! ShowAfterFirst and ! ShowBeforeLast . To show the center button group, both base conditions must be false: ! (ShowAfterFirst || showBeforeLast) .
  
  
  
  https://jsfiddle.net/0sjgrcxu/1/

  Anonymous

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