[Vuejs]-How to get sum of array in vue js using computed?

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Reduce() is an array function in javascript. You either want to use forEach for your object or rewrite it to an array.

const data = [
      { deduction: 625 },
      { deduction: 500 },
      { deduction: 2500 },
      { grandTotal: 8460 },
      { otTotal: 50 },
    ];

    function totaldeduct(data) {
      return data.reduce((acc, item) => {
        if(item.deduction)
          return acc + item.deduction;
        else return acc
      }, 0);
    }

    let reduced = totaldeduct(data);

    console.log(reduced);

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