如何在实际映射中转换字符串“ key：value”？

Question

Is it possible to transform a string containing "key:value key2:value" in an actual Golang map?

Example:

package main

type Test struct{
  options map[string]interface{}
}

func main() {
   string := "key:value key2:key:value"
   var test Test
   /// Do something to parse string into test.Options
}

Thanks!

Answer 1

Yes, you can definitely parse that string into a map of the type you specify!

Take a look at the "strings" package, in particular strings.SplitN(...). Consider these examples and think about how you can combine them, along with iteration, to populate that map:

str := "key:value key2:key:value"

kvs := strings.SplitN(str, " ", -1)
// []string{
//  "key:value",
//  "key2:key:value",
// }

kv1 := strings.SplitN(kvs[1], ":", 2)
// []string{
//   "key2",
//   "key:value",
// }

That is, you can split the string by spaces () to get each key/value pair, then you can split by colons (:) to split each pair into their own parts. Finally, you just need to add each pair to the map!

Notice that when you call strings.SplitN(...) with -1 as the final argument it will split the input string into as many substrings as are present:

kv1 := strings.SplitN(kvs[1], ":", -1) // Note the -1 here
// []string{
//   "key2",
//   "key",
//   "value",
// }