output.txt

~ ❯❯❯ go run test.go
sum 883.348µs 491499.30088724016
max 683.371µs 45508.46704409849
min 708.77µs -53997.430680224774

runtime-aggregation-test.go

package main

import (
	"fmt"
	"math"
	"math/rand"
	"time"
)

func main() {
	vals := make([]float64, 1000000)
	for i := 0; i < len(vals); i++ {
		vals[i] = rand.NormFloat64() * 10000
	}

	pre := time.Now()
	sum := float64(0)
	for i := 0; i < len(vals); i++ {
		sum += vals[i]
	}
	fmt.Println("sum", time.Now().Sub(pre), sum)

	pre = time.Now()
	max := -math.MaxFloat64
	for i := 0; i < len(vals); i++ {
		if vals[i] > max {
			max = vals[i]
		}
	}
	fmt.Println("max", time.Now().Sub(pre), max)

	pre = time.Now()
	min := math.MaxFloat64
	for i := 0; i < len(vals); i++ {
		if vals[i] < min {
			min = vals[i]
		}
	}
	fmt.Println("min", time.Now().Sub(pre), min)
}