Test evenness of random distribution (are all values from 0 to n equally likely) of golang rand.Intn() - (Result rand.Intn(n) does provide an even distribution)

rand_distribution.go

package main

import (
	"fmt"
	"math/rand"
)

const (
	ChunkSize = (1 << 16)
	NumValues = 100
)

func main() {
	counts := make(map[int]int)

	for i := 0; i < 100; i++ {
		for j := 0; j < 1<<16; j++ {
			rnd := rand.Intn(100)
			counts[rnd] = counts[rnd] + 1
		}
	}
	for i := 0; i < NumValues; i++ {
		fmt.Printf("%d: got %d hits\n", i, counts[i]) // kst2 was used to easily visualise the results
	}
}