Define a method named roleOf that takes the name of an actor as an argument and returns that actor's role. If the actor is not in the movie return "Not in this movie.". Ex: roleOf ("Jessica Chastain") returns "Murph". Hint: A method may access the object's properties using the keyword this. Ex: this. cast accesses the object's cast property.

var movie = {

/ / Code will be tested with different actors and movies

name: "Interstellar",

director: "Christopher Nolan",

composer: "Hans Zimmer",

cast: {

"Matthew McConaughey": "Cooper",

"Anne Hathaway": "Brand",

"Jessica Chastain": "Murph",

"Matt Damon": "Mann",

"Mackenzie Foy": "Young Murph"

},

roleOf: function (actorName) {

if (! (actorName in this. cast)) {

return "Not in this movie.";

}

return this. cast[actorName];

}

};