Go golangci-lint gocritic rangeValCopy warning

執行golantci-lint時出現gocritic的rangeValCopy警告如下。

main/main.go:123:2: rangeValCopy: each iteration copies 128 bytes (consider pointers or indexing) (gocritic)
    for _, d := range org.Departments {
    ^

意思是在loop org.Departments時，每一次loop會複製128bytes的Department元素導致效能不好，建議改用pointer或indexing的方式來loop。

下面是原本的寫法，每次loop都會從org.Departments copy元素內容到d。

for _, d := range org.Departments {
    doSomething(d)
}

改用indexing，每次loop則是從org.Departments以index直接取得陣列元素。

for i := range org.Departments {
    doSomething(org.Departments[i])
}

• How to use pointers or indexing on a range to resolve rangeValCopy gocritic message