docs: fix example README, add playground (FromSlicePtrOr) (#541)

* doc: update FromSlicePtrOr example in README

* doc: add playground for FromSlicePtrOr

* Update README.md

---------

Co-authored-by: Samuel Berthe <dev@samuel-berthe.fr>

README.md

@@ -2759,10 +2759,12 @@ Returns a slice with the pointer values or the fallback value.
 str1 := "hello"
 str2 := "world"
 
-ptr := lo.FromSlicePtrOr[string]([]*string{&str1, &str2, "fallback value"})
+ptr := lo.FromSlicePtrOr([]*string{&str1, nil, &str2}, "fallback value")
 // []string{"hello", "world", "fallback value"}
 ```
 
+[[play](https://go.dev/play/p/lbunFvzlUDX)]
+
 ### ToAnySlice
 
 Returns a slice with all elements mapped to `any` type.

type_manipulation.go

@@ -70,6 +70,7 @@ func FromSlicePtr[T any](collection []*T) []T {
 }
 
 // FromSlicePtrOr returns a slice with the pointer values or the fallback value.
+// Play: https://go.dev/play/p/lbunFvzlUDX
 func FromSlicePtrOr[T any](collection []*T, fallback T) []T {
 	return Map(collection, func(x *T, _ int) T {
 		if x == nil {