could you please help me to solve this code? I need to sum the numbers. With this code I get only "017, 1, 1311 etc"

const array = [
    { id: 1, numbers: [1,] },
    { id: 2, numbers: [7, 1, 13] },
    { id: 3, numbers: [11, 11, 3, 3] },
    { id: 4, numbers: [4, 22, 8, 4, 6, 2] },
  ];

let totalResult = 0;

array.forEach(item => { 
  totalResult  = item.numbers;
}); 

console.log(totalResult); 

CodePudding user response：

item.numbers is an Array i.e: numbers: [7, 1, 13].
By doing i.e: totalResult = item.numbers you're basically concatenating an Array.toString() to a Number.
[1, 2, 3].toString() will equal "1,2,3" - then 0 = "1,2,3" results in "01,2,3".

Instead, reduce your array to Number:

const array = [
  {id: 1, numbers: [1]},
  {id: 2, numbers: [7, 1, 13]},
  {id: 3, numbers: [11, 11, 3, 3]},
  {id: 4, numbers: [4, 22, 8, 4, 6, 2]},
];

const tot = array.reduce((n, item) => n   item.numbers.reduce((n, i) => n   i), 0);

console.log(tot); // 96

CodePudding user response：

item is an object in your forEach loop, so you have to loop through item.numbers to get the actual number and then add with totalResult.

const array = [
    { id: 1, numbers: [1] },
    { id: 2, numbers: [7, 1, 13] },
    { id: 3, numbers: [11, 11, 3, 3] },
    { id: 4, numbers: [4, 22, 8, 4, 6, 2] },
  ];

let totalResult = 0;

array.forEach(item => { 
  item?.numbers.forEach(num => {
    totalResult  = num;
  })
}); 

console.log(totalResult);