Adding Using Reduce Function in JavaScript [duplicate]

Question

I have a very simple problem. I wanted to get the total gross using reduce function. My problem is that its a string but I already added + to make it a number. I wonder that output is still NaN?

const hello = [
    {
        "gross": "391.50",
    },
    {
        "gross": "489.80",
    }
]

const final = hello.reduce((prev, cur) => Number(prev.gross) + Number(cur.gross), 0);

console.log(final, 'FINAL')

Barmar · Accepted Answer · 2022-07-20 23:45:44Z

0

prev is the running total, not an object, there's no prev.gross.

const hello = [{
    "gross": "391.50",
  },
  {
    "gross": "489.80",
  }
]

const final = hello.reduce((prev, cur) => prev + Number(cur.gross), 0);

console.log(final, 'FINAL')

answered Jul 20, 2022 at 23:45

Barmar

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2 Comments

Joseph Over a year ago

is Number or + better?

Barmar Over a year ago

The difference is negligible. Number is more readable IMHO.

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