CODEWITHSUNDEEP
arraysreactjsuse-state
Vishwanath Ezhil
Vishwanath Ezhil

Reputation: 69

useState is not updating inside array.map(). ReactJS

I am trying to add the values of an array by using useState inside an array.map but the values are not updating

function App() {
  const [ingredients, setIngredients] = useState([]);
  
  const getIngredients = (data) => {
    data.map((item, i) => {
      console.log(data[i]);
      setIngredients([...ingredients, data[i]]);
     // setIngredients([...ingredients, item]); <- Also doesnt work 
      console.log(ingredients);
    });

Console.log(data)

(26) ["Product", "Information↵NUTELLA", "HAZELNUT", "SPREAD", "↵Total:", "↵aty:", "↵BARILLA", "SPAGHETTI", "Z↵Total:", "↵CLASSICO", "CRMY", "ALFERO", "DI", "ROMA", "PENNE", "RIGATE", "PASTA", "↵Order", "Summary↵item", "Subtotat", "↵Sales", "Tax", "Total:", "", "↵", Array(0)]

console.log(ingredients);

[]

console.log(items);

Lists out all the items one after the other

Upvotes: 0

Views: 1230

Answers (1)

Kondalarao V
Kondalarao V

Reputation: 800

setState is asynchronous so it doesn't guarantee an updated state from before, so pass a function to setState to make it work.

setIngredients((ingredients) => [...ingredients, data[i]]);

Upvotes: 2

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