How to fix error (cant access lexical declaration Array before initialization ) in react.js?

Question

I set the array in onchange method and I see it in the console with console.log("array =",array) with all elemets but when I want to delete the duplicate element with Array.from(new Set(array)) method in the update method , I find error in the console ( cant access lexical declaration Array before initialization ) !

const [array, setArray] = useState([]); 

const update = (e) =>{ 

  e.preventDefault();  console.log("array =",array);  // = [ 1,  1, 2, 2, 51, 51 ] 
  
  if( array !==undefined){ 
  
    const Array = Array.from(new Set(array));    // error   } }
    
    setarticlesolde((pre) => {      
 
      setArray((pre) => [pre.articleId]);
      return  [... pre];
    })

Not much of your code makes sense. 1) array will always have a length of zero so: if (array.length) would be better. 2) Don't assign something to Array. Use another variable name. 3) What is artItem? 4) What is setarticlesolde, and why are you returning an array from it? — Andy
– Andy, Commented Apr 24, 2022 at 0:57
Change const Array = Array.from(new Set(array)); to const arr = Array.from(new Set(array)); and see if that fixes the problem — Pavindu
– Pavindu, Commented Apr 24, 2022 at 0:59
It workin when I add var arr =0; arr = Array.from(new Set(array)); — cazorna 77
– cazorna 77, Commented Apr 24, 2022 at 1:12

cazorna 77 · Accepted Answer · 2022-04-24 17:57:35Z

1

It workin when I change

const Array = Array.from(new Set(array));

to

var arr =0; arr = Array.from(new Set(array));

you cant use Array like variable because it already defined as existe function in javascript(React.js)

edited Apr 24, 2022 at 17:57

answered Apr 24, 2022 at 1:17

cazorna 77

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Comments

xijdk · Accepted Answer · 2022-04-24 18:17:44Z

0

Simply change your code to const arr = Array.from(new Set(array)). Array is js inner variable.

answered Apr 24, 2022 at 18:17

xijdk

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