How to efficiently filter a map based on a condition in Go?

In Go, you can efficiently filter a map based on a condition using the following steps:

Create a new map to store the filtered values.
Iterate over the keys and values of the original map using a for range loop.
Apply your condition to each value, if it returns true, add the key-value pair to the new filtered map.
Return the filtered map.

Here's an example of filtering a map of strings based on a condition where the length of the value is greater than 5:

func filterMap(originalMap map[string]string, condition func(string) bool) map[string]string {
    filteredMap := make(map[string]string)

    for key, value := range originalMap {
        if condition(value) {
            filteredMap[key] = value
        }
    }

    return filteredMap
}

func main() {
    originalMap := map[string]string{
        "key1": "value123",
        "key2": "abc",
        "key3": "someotherstring",
    }

    filteredMap := filterMap(originalMap, func(value string) bool {
        return len(value) > 5
    })

    fmt.Println(filteredMap)
}

Output:

map[key1:value123 key3:someotherstring]

In this example, the filterMap function takes the original map and a condition function as parameters. It iterates over the original map's key-value pairs and checks if the condition function returns true for each value. If it does, the key-value pair is added to the filtered map. Finally, the filtered map is returned.