hoping you can help below is a concise version of my code.
basically im passing an array of structs to floatInSlice() in which either a new struct gets added to the array or an existing struct AudienceCategory.Sum gets ++
all is generally working fine except for the b.Sum = b.Sum+1
Now I know that if I want to pass an obect as a pointer rather than value I need to use */& but I just cant seem to get it working, any help much appriciated!
type AudienceCategory struct {
Cat int
Sum int
}
var counter = []AudienceCategory{}
func main() {
for i := 1; i < len(words); i++ {
counter = floatInSlice(category,counter)
if counter != nil{}
}
fmt.Printf("%v ", counter)
}
func floatInSlice(category int, counter *[]AudienceCategory) []AudienceCategory {
for _, b := range counter {
if b.Cat == category {
b.Sum = b.Sum+1
return counter
}
}
x := AudienceCategory{Cat:category,Sum:1}
counter = append( counter, x)
return counter
}
EDIT *******
got it working in the end thanks for the help guys
func floatInSlice(category int, counter []AudienceCategory) []AudienceCategory {
for i := 0; i < len(counter); i++ {
if counter[i].Cat == category {
counter[i].Sum = counter[i].Sum+1
return counter
}
}
x := AudienceCategory{Cat:category,Sum:1}
counter = append( counter, x)
return counter
}
When you use value range as in _, b := range counter
, b
contains a copy of each element of counter
. So you are summing a copy that is lost, not the element in the slice.
You should use
func floatInSlice(category int, counter *[]AudienceCategory) []AudienceCategory {
for i, b := range *counter {
if b.Cat == category {
(*counter)[i].Sum = (*counter)[i].Sum+1
return counter
}
}
x := AudienceCategory{Cat:category,Sum:1}
counter = append( counter, x)
return counter
}
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