I have a type...
type MyType struct {
Job string `json:"Job"`
Cost string `json:"Cost"`
}
A slice of this type...
var records []MyType
It is populated as follows...
records = append(records, MyType{Job: 100, Cost:234},)
records = append(records, MyType{Job: 101, Cost:4000},)
records = append(records, MyType{Job: 102, Cost:700},)
I would like to sort the 'rows' by cost descending so...
records[0].Job would equal 101 records[0].Cost would equal 4000
records[1].Job would equal 102 records[1].Cost would equal 700
records[2].Job would equal 100 records[2].Cost would equal 234
In c# i would normally use linq, but I am new to go and not sure how to go about this...
first of all json type is invalid. Cost should be int type
try this code
import (
"fmt"
"sort"
)
type Records []MyType
type MyType struct {
Job int `json:"Job"`
Cost int `json:"Cost"`
}
func (r Records) Len() int { return len(r) }
func (r Records) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
func (r Records) Less(i, j int) bool { return r[i].Cost > r[j].Cost }
func main() {
records := make(Records, 0, 1000)
records = append(records, MyType{Job: 100, Cost: 234})
records = append(records, MyType{Job: 101, Cost: 4000})
records = append(records, MyType{Job: 102, Cost: 700})
sort.Sort(records)
fmt.Println(records)
}
or without custom slices
type MyType struct {
Job int `json:"Job"`
Cost int `json:"Cost"`
}
func main() {
records := make([]MyType, 0, 1000)
records = append(records, MyType{Job: 100, Cost: 234})
records = append(records, MyType{Job: 101, Cost: 4000})
records = append(records, MyType{Job: 102, Cost: 700})
sort.Slice(records, func(i, j int) bool {
return records[i].Cost > records[j].Cost
})
fmt.Println(records)
}
output
[{101 4000} {102 700} {100 234}]