I want to add another object to my exiting object but i doesn't get the value as others object have instead it gets a text, I tried a easy solution but didn't work, here is that i'm facing:

ConsoleLog Image

So instead of the key long I want to keep the numbers as they started from 0, but I don't know how?

Here is what I've tried:

  const addToWatchlist = (movie) => {
    const long = movies.length;
    const data = {...movies, long: movie};
    setMovies(movies)

ps: I'm using React.