package main

import (
	"fmt"
	"math"
	"sync"
)

func CreateSqrtMap() map[int]float64 {
	numKeys := 100_000
	newMap := make(map[int]float64)

	for i := range numKeys {
		newMap[i] = math.Sqrt(float64(i))
	}
	return newMap
}

var initCreateMapSqrt func() map[int]float64 = sync.OnceValue(CreateSqrtMap)

func main() {
	sqrtMap := initCreateMapSqrt()
	n := 100_000 / 1_000
	for i := range n {
		keyVal := i * 1_000
		fmt.Printf("Value of map by key[%d]: %f\n", keyVal, sqrtMap[keyVal])
	}
}