How do I remove duplicates from a struct slice? [closed] - go

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I have a struct like this:
type structData struct {
dataName string
dataNum int
}
And I have created a slice out of them, like so:
dataSlice := []*structData{}
I have a loop that populates the dataName string and just after this, I want the struct slice to be checked through and duplicates removed.
I mention this specifically because currently, dataNum is 0. So, I don't want to check if the string inside my struct is same or not, it is totally fine checking if the entire struct is equal (if that's possible, else it is also OKAY for me to check duplicates in the dataName string, I just don't know what would look better in design).
An example output of what my struct slice looks like:
&{dataname1 0}
&{dataname1 0}
&{dataname2 0}
&{dataname2 0}
What I want it to look like:
&{dataname1 0}
&{dataname2 0}

Answer 1

You can use a map to check for duplicates, where your struct is the key to the map.
package main
import (
"fmt"
)
type structData struct {
dataName string
dataNum int
}
func (d *structData) String() string {
return fmt.Sprintf("(%s,%d)", d.dataName, d.dataNum)
}
func main() {
dataSlice := []*structData{
{"dataname1", 0},
{"dataname1", 0},
{"dataname2", 0},
{"dataname2", 0},
}
m := map[structData]struct{}{}
dataSlice2 := []*structData{}
for _, d := range dataSlice {
if _, ok := m[*d]; !ok {
dataSlice2 = append(dataSlice2, d)
m[*d] = struct{}{}
}
}
fmt.Printf("%v\n", dataSlice)
fmt.Printf("%v\n", dataSlice2)
}
https://play.golang.org/p/wL-SfBCMGQj