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Calculating sum of array objects in javascript , TypeError: parseInt(…).reduce is not a function

March 11, 2022

I have a array of objects with numbers but there type is string , I want to sum them all.

I’m doing this way as of previous answers on stack-overflow suggested.

// Here the data has an array of goods which contains
// amount objects and i want to calculate to sum of amount objects
Total Invoice Price:
{data.goods
   ? data.goods.map((item) => (
    <div key={item.id}>
     <div>{parseInt(item.amount).reduce((a, b) => a + b, 0)}</div>
       </div >
       ))
     : null}

But im getting error TypeError: parseInt(...).reduce is not a function , How to fix this ?

>Solution :

reduce is an array method. So: instead of mapping over the data, call a function within your JSX that returns the sum of the amount values of each object in the array.

Note: if your amount values are strings coerce them to numbers first (Number(good.amount)).

function Example({ data }) {

  function getTotal(data) {
    return data.goods.reduce((acc, good) => {
      return acc + Number(good.amount);
    }, 0);
  }

  return (
    <div>
      <h4>Total</h4>
      <p>{getTotal(data)}</p>
    </div>
  );

}

const data = { goods: [{ amount: '1' }, { amount: '5' }, { amount: '13' }] };

ReactDOM.render(
  <Example data={data} />,
  document.getElementById('react')
);

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>
<div id="react"></div>