sumBy

math

This method is like sum except that it accepts iteratee which is invoked for each element in array to generate the value to be summed.

Signature

sumBy<T>(array: T[], iteratee: (value: T) => number): number

Parameters

Name	Type	Description
`array`	`T[]`	The array to iterate over
`iteratee`	`(value: T) => number`	The iteratee invoked per element

Returns

number - Returns the sum

Examples

With objects

import { sumBy } from 'dashlite'

const objects = [{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }]
const result = sumBy(objects, (o) => o.n)
console.log(result)

Output:

20

Available since version 1.0.0

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