When using a variable to call an object from a JSON file, it doesn't call it at all

Question

Using JS in conjunction with a JSON file to turn a room ID into the room information.

function rooms(roomID) {
    const roomsDB = require("./rooms.json")
    let roomsID = "r".concat("", roomID).toString()
    console.log(roomsDB.roomsID)
}

rooms(46)

This is the function I'm using to turn the ID into the info, and the rooms.json file is as follows:

{
    "r46":"house"
}

Ideally, this would log house into the console, but I only get undefined. Why isn't the JSON object being called properly?

`roomsDB[roomsID]` - that's how you access object properties programmatically. — Tsvetan Ganev, Aug 09 '21 at 06:48

score 1 · Accepted Answer · answered Aug 09 '21 at 06:48

1

To dynamically access an object property by name in a string variable you need to use brackets:

roomsDB[roomsID]

The dot (roomsDB.roomsID) is just like roomsDB["roomsID"], it doesn't substitute the variable.

answered Aug 09 '21 at 06:48

Tobias K.

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When using a variable to call an object from a JSON file, it doesn't call it at all

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