Sort slice on number of occurrences of a value
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Please see this playground. I have a slice with some data. Now I want to sort this slice, but not on a value inside one of the values, but I want to sort it on the number of occurrences of one of the values.
Unfortunately I don't have a clue how to fix this. Can someone please point me to the right direction?
I know I can do this:
sort.Slice(messages, func(i, j int) bool {
return messages[i].SupplierID < messages[j].SupplierID
})
This will sort the slice, but it will start with the "higest" supplierID. but what I want is to sort on the number of occurrences: the ones with the lease number of supplierIDs first.
sorting go slice
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
add a comment |
Please see this playground. I have a slice with some data. Now I want to sort this slice, but not on a value inside one of the values, but I want to sort it on the number of occurrences of one of the values.
Unfortunately I don't have a clue how to fix this. Can someone please point me to the right direction?
I know I can do this:
sort.Slice(messages, func(i, j int) bool {
return messages[i].SupplierID < messages[j].SupplierID
})
This will sort the slice, but it will start with the "higest" supplierID. but what I want is to sort on the number of occurrences: the ones with the lease number of supplierIDs first.
sorting go slice
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
add a comment |
Please see this playground. I have a slice with some data. Now I want to sort this slice, but not on a value inside one of the values, but I want to sort it on the number of occurrences of one of the values.
Unfortunately I don't have a clue how to fix this. Can someone please point me to the right direction?
I know I can do this:
sort.Slice(messages, func(i, j int) bool {
return messages[i].SupplierID < messages[j].SupplierID
})
This will sort the slice, but it will start with the "higest" supplierID. but what I want is to sort on the number of occurrences: the ones with the lease number of supplierIDs first.
sorting go slice
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
Please see this playground. I have a slice with some data. Now I want to sort this slice, but not on a value inside one of the values, but I want to sort it on the number of occurrences of one of the values.
Unfortunately I don't have a clue how to fix this. Can someone please point me to the right direction?
I know I can do this:
sort.Slice(messages, func(i, j int) bool {
return messages[i].SupplierID < messages[j].SupplierID
})
This will sort the slice, but it will start with the "higest" supplierID. but what I want is to sort on the number of occurrences: the ones with the lease number of supplierIDs first.
sorting go slice
sorting go slice
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
asked Nov 26 '18 at 20:26
Rogier LommersRogier Lommers
8982823
8982823
add a comment |
add a comment |
1 Answer
1
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oldest
votes
Iterate over the slice, populate a map of occurrences, then sort the slice based on the number of occurrences:
supplierCounts := make(map[int]int)
for _, msg := range messages {
supplierCounts[msg.SupplierID]++
}
sort.Slice(messages, func(i, j int) bool {
return supplierCounts[messages[i].SupplierID] < supplierCounts[messages[j].SupplierID]
})
https://play.golang.org/p/YMWPP2JBC2P
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Iterate over the slice, populate a map of occurrences, then sort the slice based on the number of occurrences:
supplierCounts := make(map[int]int)
for _, msg := range messages {
supplierCounts[msg.SupplierID]++
}
sort.Slice(messages, func(i, j int) bool {
return supplierCounts[messages[i].SupplierID] < supplierCounts[messages[j].SupplierID]
})
https://play.golang.org/p/YMWPP2JBC2P
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
add a comment |
Iterate over the slice, populate a map of occurrences, then sort the slice based on the number of occurrences:
supplierCounts := make(map[int]int)
for _, msg := range messages {
supplierCounts[msg.SupplierID]++
}
sort.Slice(messages, func(i, j int) bool {
return supplierCounts[messages[i].SupplierID] < supplierCounts[messages[j].SupplierID]
})
https://play.golang.org/p/YMWPP2JBC2P
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
add a comment |
Iterate over the slice, populate a map of occurrences, then sort the slice based on the number of occurrences:
supplierCounts := make(map[int]int)
for _, msg := range messages {
supplierCounts[msg.SupplierID]++
}
sort.Slice(messages, func(i, j int) bool {
return supplierCounts[messages[i].SupplierID] < supplierCounts[messages[j].SupplierID]
})
https://play.golang.org/p/YMWPP2JBC2P
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
Iterate over the slice, populate a map of occurrences, then sort the slice based on the number of occurrences:
supplierCounts := make(map[int]int)
for _, msg := range messages {
supplierCounts[msg.SupplierID]++
}
sort.Slice(messages, func(i, j int) bool {
return supplierCounts[messages[i].SupplierID] < supplierCounts[messages[j].SupplierID]
})
https://play.golang.org/p/YMWPP2JBC2P
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
answered Nov 26 '18 at 20:33
Tim CooperTim Cooper
122k32244230
122k32244230
add a comment |
add a comment |
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