> For the complete documentation index, see [llms.txt](https://tedirghazali.gitbook.io/algajs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tedirghazali.gitbook.io/algajs/array/sum.md).

# $.array.sum

You may want to use this `sum` helper in order for you to calculate the entire array values.

```
$.array.sum(fromArray, byObjectProperty)

$.array.sum([1, 2, 3, 4, 5, 6])
//=> 21
```

Or maybe you want to compute only certain object property from array of objects, to do this, we need to add second argument with object property name.

```
const fromArray = [
  { id: 1, name: 'Hanbal Tedir', office: 'Jakarta', age: 30 },
  { id: 2, name: 'Dawoud Tedir', office: 'Medan', age: 27 },
  { id: 3, name: 'Harist Tedir', office: 'Sigli', age: 15 },
  { id: 4, name: 'Tedir Ghazali', office: 'Banda Aceh', age: 29 },
  { id: 5, name: 'Hanbal Usman', office: 'Langsa', age: 27 },
  { id: 6, name: 'Dawoud Usman', office: 'Pidie', age: 25 },
  { id: 7, name: 'Harist Usman', office: 'Samarinda', age: 18 },
  { id: 8, name: 'Ghazali Usman', office: 'Balikpapan', age: 45 },
  { id: 9, name: 'Bukhari Usman', office: 'Makassar', age: 44 },
  { id: 10, name: 'Boyhaki Usman', office: 'Jaya Pura', age: 35 },
  { id: 11, name: 'Zulkifli Usman', office: 'Manado', age: 56 },
  { id: 12, name: 'Teuku Usman', office: 'Ternate', age: 58 }
]
$.array.sum(fromArray, 'age')
//=> 409
```

If you do not like using `sum` helper from Alga.js, you can use a reduce method to calculate all the array numbers.

```
const fromArray = [1, 2, 3, 4]
const sum = (arr) => {
  return arr.reduce((accumulator, currentValue) => {
    return accumulator + currentValue
  })
}
sum(fromArray)
//=> 10
```


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