FindByTitleKotlin.kt

var findByTitle: (String) -> (MutableList<Movie>) -> List<Movie> = 
    { query -> { collection ->
        val predicate = matches(query)
        filter(predicate)(collection)
    }}

val filter: ((Movie) -> Boolean) -> (List<Movie>) -> List<Movie> = 
    { predicate -> { collection ->
        collection.filter(predicate)
    }}

val matches: (String) -> (Movie) -> Boolean = 
    { query -> { movie -> 
        isInfixOf(query) (title(movie))
    }}

val title: (Movie) -> String = 
    { movie -> movie.title}

val isInfixOf: (String) -> (String) -> Boolean = 
    { query -> { string -> 
        string.contains(query)
    }}