Golang how to range in pointer array
arrays, go, pointers
Solution
Use the `range` keyword. https://github.com/golang/go/wiki/Range
for i, person := range *manager.allPerson {
fmt.Println(person.name)
}
Note that the compiler will be angry if you don't use the index var `i`. If you don't intend to use it, replace with `_`.
To further explain, your original error was due to the fact that you correctly dereferenced your `*[]Person` the first time, but not inside the `for` loop.
fmt.Println(manager.allPersons[:ii].name) // wrong
fmt.Println((*manager.allPersons)[:ii].name) // right
Also, given that your `slice` contains `Person` struct values, it will have to copy it if you use the optional second value in the `range` expression. Thus, it would be more efficient to keep using just the indexes.
As a suggestion, don't use a `*[]Person`, use `[]*Person`, which is probably what you intended to use anyway. A `slice` is already a pointer value. Using `[]*Person` you don't have to fear a copy by the `range` expression because it is simply a pointer to a `Person` instead of the entire struct.
In fact, unless you either change the type to `[]*Person` or index into the `slice` you won't be able to have changes reflected in the slice because a struct value will be a copy in the `range` loop. See https://github.com/golang/go/wiki/Range#gotchas but be aware that if the value is a pointer value, this isn't an issue.
Problem
if I have PersonManager struct and it has *[]Person array. I want to range every item in this array. For example ``` manager := *PersonManager for ii := 0; len(*manager.allPersons); ii++{ fmt.Println(manager.allPersons[:ii].name) } ``` for this example, manager variable is pointer and array that in this variable is pointer too. How can I range this items? Not: I m getting cannot slice manager.allPersons (type *[]Person) error