What is the correct way to filter a &[&str]?

I am trying to filter an array of type &[&str] in the following way, in able to exclude the " " case:

let example_array : &[&str] = &["hello", " ", "world"]; 
let filtered_array : &[&str] = example_array.iter().copied().filter(|&word| word != " ").collect();

The error I get is:

value of type &[&str] cannot be built from std::iter::Iterator<Item=&str>

Could someone explain why is not working, and where to look for solution?

&[&str] is a reference to a slice (array) of string references. This works with your static array of strings because the compiler is able to put it into a static data section and create a reference to it. The collect function cannot return a &[&str], but it can return a dynamically allocated Vec<&str>

let example_array: &[&str] = &["hello", " ", "world"];
let filtered_array: Vec<&str> = example_array.iter().copied().filter(|&word| word != " ").collect();

EDIT:

Vec<&str> implements Deref<Target = [&str]>, meaning you can use a Vec<&str> as a &[&str] by taking a reference to it.

let filtered_array_ref: &[&str] = &filtered_array;