Golang Is Shit E001

GISE001_correct.go

package main

import (
	"encoding/json"
	"fmt"
)

const strListOfNode = `[{"Type":1, "Cpu":1, "Mem":1},{"Type":2, "Cpu":2, "Mem":2}]`

type Node struct {
	Type int
	Cpu  int
	Mem  int
}

type Resource struct {
	Cpu *int
	Mem *int
}
type NodeType2SpecMap map[int]*Resource

func main() {
	var listOfNodes []Node
	err := json.Unmarshal([]byte(strListOfNode), &listOfNodes)
	if err != nil {
		panic(err)
	}
	resMap := make(NodeType2SpecMap, 0)
	// Implementation 1: Correct output {"1":{"Cpu":1,"Mem":1},"2":{"Cpu":2,"Mem":2}}
	for _, rec := range listOfNodes {
		if _, exists := resMap[rec.Type]; !exists {
			var cpu = rec.Cpu
			var mem = rec.Mem
			limit := Resource{
				Cpu: &cpu,
				Mem: &mem,
			}
			resMap[rec.Type] = &limit
		}
	}

	// print resMap
	b, _ := json.Marshal(resMap)
	fmt.Println(string(b))
}

GISE001_wrong.go

package main

import (
	"encoding/json"
	"fmt"
)

const strListOfNode = `[{"Type":1, "Cpu":1, "Mem":1},{"Type":2, "Cpu":2, "Mem":2}]`

type Node struct {
	Type int
	Cpu  int
	Mem  int
}

type Resource struct {
	Cpu *int
	Mem *int
}
type NodeType2SpecMap map[int]*Resource

func main() {
	var listOfNodes []Node
	err := json.Unmarshal([]byte(strListOfNode), &listOfNodes)
	if err != nil {
		panic(err)
	}
	resMap := make(NodeType2SpecMap, 0)
	// Implementation 2: Wrong output {"1":{"Cpu":2,"Mem":2},"2":{"Cpu":2,"Mem":2}}
	for _, rec := range listOfNodes {
		if _, exists := resMap[rec.Type]; !exists {
			resMap[rec.Type] = &Resource{
				Cpu: &rec.Cpu,
				Mem: &rec.Mem,
			}
		}
	}

	// print resMap
	b, _ := json.Marshal(resMap)
	fmt.Println(string(b))
}

https://github.com/xxpxxxxp/intellij-plugin-golangci-lint/blob/master/explanation/exportloopref.md