Access specific element of an array using Lodash in Node.js

Question

I have this array of object

const database = {
    users: [
    {
        id:1,
        name: "John",
        email: "[email protected]",
        passowrd: "h4ckM3!ifuc4n",
        entries: 0,
        joined: new Date(),

    },
    {
        id:2,
        name: "Mila",
        email: "[email protected]",
        passowrd: "mila",
        entries: 0,
        joined: new Date(),

    },
    {
        id:3,
        name: "Luke",
        email: "[email protected]",
        passowrd: "123",
        entries: 0,
        joined: new Date(),

    }

    ]
}

I'm trying to query a specific element from that array

app.get("/profile/:id", function (req, res) {

    console.log(req.params.id);
    // const user = _.find(database.users, {id: req.params.id });

    var user = _.find(database.users, {id:req.params.id});
    console.log(user);

    if(!user) {
       res.status(404).json("no user found");
    }

});

I kept getting

Example app listening on port 3002!
1
undefined

Any hints for me?

Why bother with Lodash? const user = database.users.find(({ id }) => id == req.params.id). The == comparison will compare numbers with numeric strings without requiring parsing — Phil
– Phil, Commented Oct 13, 2020 at 1:35

Jonas Grønbek · Accepted Answer · 2020-10-13 21:03:25Z

4

You really do not need lodash for that. I would not suggest using it since it creates unnecessary overhead.

const user = database.users.find(user => user.id == req.params.id)

Should work just fine.

be aware that == is an unsafe check, and in case req.params.id is undefined it would match a user with the id of 0.

to mitigate this you could convert the req.params.id to a number and use a safe check operator === instead. (it checks that they aren't just comparable, but actually the same type and value)

const user = database.users.find(user => user.id === parseInt(req.params.id, 10)

edited Oct 13, 2020 at 21:03

answered Oct 13, 2020 at 1:34

Jonas Grønbek

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1 Comment

code-8 Over a year ago

Thanks, Jonas, it's a clean and simple JS solution.

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