可变的结构域的一部分

Question

My application has a slice of a struct like so

type ItemOrder struct {
    ItemId
    ...
}

var items = []*ItemOrder

And a variadic function accepting ...int

func ItemIds(lang string, ids ...int){
...

How can I take all itemIds from the items []*ItemOrder slice and supply it to the variadic function? Something like

itemsPB, err := ItemIds("", items[:].itemId)

Abov doesnt work because im not giving the slice a position to extract itemId from.

Answer 1

You have to create a new slice for the IDs, and use a loop to populate it. There is no shortcut.

For example:

ids := make([]int, len(items))
for i, item := range items {
    ids[i] = item.ItemId
}
ItemIds("en", ids...)

Try it on the Go Playground.