[GO] Binary string to decimal converter

main.go

package main

import "fmt"

func main() {
	fmt.Println(
		BinaryStringToDecimal("0110"), // 6
		BinaryStringToDecimal("0011"), // 3
	)
}

func BinaryStringToDecimal(bin string) int {
	result := 0
	ii := len(bin)
	pow := 1

	for i := 0; i < ii; i++ {
		d := bin[ii-i-1]
		n := 0
		if d == '1' {
			n = 1
		}
		result += pow * n
		pow *= 2
	}

	return result
}