I would like to write a code with Go, that it checks if a character in the File1 exists in the File2 or not.
If it exist, skip; if it doesn't exist, write it in the file 2..
May you help me please? I couldn't paste here my code, but you can chek it from here: https://go.dev/play/p/IX_ibwya1B1
Converting []byte to a map[byte]bool lets you use the comma ok notation to check if a byte exits in a map.
In your example, you can convert to a map the []byte of File2 and then loop for the bytes in File1 to check if some of them exist in the map.
func main() {
file1 := []byte("Hello world!")
file2 := []byte("Say Hello!")
m := convertToMap(file2)
for _, v := range file1 {
if _, ok := m[v]; !ok {
fmt.Println(string(v))
}
}
}
func convertToMap(b []byte) map[byte]bool {
m := map[byte]bool{}
for _, v := range b {
m[v] = true
}
return m
}