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I wonderer how to have a function with parameter option.

I have a function who I have label, brand, and shop parameter. But it's not working and I don't know how to fix that..

const getTransaction = (shop?:string, brand?:string, label:string) => {
if(shop && brand === null){
   return label
}else {
  return shop + brand;
  }
}
getTransaction("brand","topshop", "topshop - brand")
getTransaction(null,null, "topshop - brand")
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  • Install an IDE. A required parameter cannot follow an optional parameter. is what the error says. Commented Mar 23, 2020 at 9:55

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you cannot put optional parameters before mandatory parameters

(label:string, shop?:string, brand?:string) should work

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