True or false output based on a probability

main.go

package main

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

func Decision(probability float64) bool {
	// randFloat64() returns a float64, `0.0 <= f < 1.0`
	return rand.Float64() <= probability
}

func main() {
	rand.Seed(time.Now().UTC().UnixNano())

	counts := make(map[bool]int)
	
	for i:=0; i < 100000; i++ {
		res := Decision(0.1)
		counts[res]++
	}
	
	fmt.Println(counts)
}