Searchbar cant filter JSON File Javascript

Question

today i have a problem with my searchbar.

const [posts, setPosts] = useState(null)
const [searchTerm, setSearchTerm] = useState("")

useEffect(() => {
    const loadPosts = async () => {
        try {
            const post = await getAllPosts()
            setPosts(post)
        } catch (e) {
            alert("Couldn't load posts")
        }
    }
    loadPosts()
}, [])

return (
    <div>
        <input type={"text"} placeholder="Search..." onChange={event => {
            setSearchTerm(event.target.value)
        }}/>

    </div>
)

}

This is my Searchbar Component. In the Index file, did i gave a props with.

const [posts, setPosts] = useState([])
const [searchTerm, setSearchTerm] = useState("")

useEffect(() => {
    const loadPosts = async () => {
        try {
            const post = await getAllPosts()
            setPosts(post)
        } catch (e) {
            alert("Couldn't load posts")
        }
    }
    loadPosts()
}, [])

return (
    <div className={styles.posts}>
        <h1>Market-place Valando</h1>
        <SearchList title={posts.filter(post => {
            if (post.title.toLowerCase().includes(searchTerm.trim().toLowerCase()) && searchTerm.trim() !== "") {
                return post.title
            }
        }).map(titles => {
                {
                    {titles.title}
                }
            }
        )}/>



        {
            posts.map(post => {
                return (
                    <div key={post.id} className={styles.key}>
                        <h1>{post.title}</h1>
                        <Image width={1000} height={1000} src={post.image}/>
                        <p>Price: {post.price}.-</p>
                        <p>Description: {post.description}</p>
                        <Link href={`/posts/${post.id}`} passHref>
                            <a>Read more</a>
                        </Link>
                    </div>
                )
            })
        }
    </div>
)

}

I have a db.json file that i connected with an API File. In this Api File i made all the fetch stuff. This shouldnt be the problem. I think the problem is, that the filter doesnt work properly, with the titels.

Answer 1

You are correct, JavaScript filter does not return specific property values, but it returns the top entries of the array, a.k.a posts. So return post.title or return true will yield the same result. However, the problem in your code appears to be that you are not returning anything from the map function. All you need to do is to change it to the following:

.map(post => post.title)