Anonymous function for range - hash set library

[raw bridge]

Greetings,

I am using this library https://github.com/G-M-twostay/Go-Utils/blob/master/Sets/HashSet/HashSet.go.
I am confused by the range function (https://github.com/G-M-twostay/Go-Utils/blob/de5fd5dbdbfd46f9e77cce13823929a74293d844/Sets/HashSet/HashSet.go#L191)

My question is: what would be the anonymous function inside of Range?

func (u *HashSet[E]) Range(f func(E) bool) {

[ebon heart]

" what would be " like what the function should do ? or what the function should looks like?

Range will iterate over each item in the set and call function f on each item.
when f return false, range stop. instead of iterating over the rest of the item in the set.

think about forEach array function in js, except you can determine, when to stop or continue.

[raw bridge]

" what would be " like what the function should do ? or what the function should looks like?
What the function should look like.

The name suggests it's used to range through the hash set but I can't figure out "what" to write as anonymous function. I don't see any iterator and I can't have access to any.

[ebon heart]

wdym by "I don't see any iterator " ?

[raw bridge]

It's a range function. How can I (or supposed to) go through the set?

[ebon heart]

you passed a callback f to Range and it'll call f on each item, passed as argument.
f return bool to tell Range, to continue or stop.
about what you do with each item, its up to you.

[raw bridge]

If I want to print the elements, I should make a function like the following?

foo.Range(func(i int) bool {
        if foo.Has(i) {
            fmt.Println(i)
            return true
        } else {
            return false
        }
    })

Where foo is my previously declared hash set.

[ebon heart]

foo.Range(func(i int) bool {
        fmt.Println(i)
        return true
    })

[raw bridge]

This is the first time I am seeing this kind of function.
Thank you very much for your help!

[ebon heart]

its similar to filepath.Walk, but filepath.WalkFunc return an error to tell filepath to stop, instead of boolean.