mapのキーの存在チェック
m := map[string]string{
"key":"value",
}
if v, ok := m["key"]; ok {
fmt.Println(v)
}
type assertions
var v any = "string"
if s, ok := v.(string); ok {
fmt.Println(v)
}
m := map[string]string{
"key":"value",
}
if v, ok := m["key"]; ok {
fmt.Println(v)
}
var v any = "string"
if s, ok := v.(string); ok {
fmt.Println(v)
}