Array Reduce or similar

I have an array:

const assets = [{
  type: 'X',
  value: 322.12
}, {
  type: 'X',
  value: 413.21
}]

I want the sum of values (735,33)

In node.js I can use: const sum = assets.reduce((s, val) => ( s = s + val.value), 0)

How can I do the same in Go?

Solution

Here is an incomplete implementation, but it gives you an idea of why this is a bad idea and non-idiomatic Go:

package main

import "fmt"

type Array []int

type ReducerFn func(prev int, next int) int

func (arr Array) Reduce(fn ReducerFn, i int) int {
    prev := i
    for _, v := range arr {
        prev = fn(prev, v)
    }
    return prev
}

func main() {
    i := Array([]int{1,2,4})
    fmt.Println(i.Reduce(func(prev int, next int) int { 
        return prev + next
    }, 10))
}

Since there are no generics in Go, you'll have to create a different reducer method for every return type, which might be quite impractical.