Access JSON data through variable .-string interpolation

Question

Trying to access integer stored under id's/keys in json object. Why doesn't this code work on its own?

 var rooms = {
    'kitchen': [7, 40, 36, 16],
    'livingroom': 31,
    'livingroom2': 15,
    'livingroom3': 38,
    'gallery': 35,
    'gallery2': 29,
    'gallery3': 12,
    'office': [22, 32],
    'neekonsbedroom': 18,
    'homeworkroom': 33,
    'diningroom': 13,
    'atrium': 11
}
function switchOne(id) {
    console.log(rooms.id)
}
 switchOne('office')

console.log() returns undefined, but simply console.log(rooms.office) returns [ 22, 32 ] Any and all help is greatly appreciated! Happy coding!

Possible duplicate of JavaScript object: access variable property by name as string — Ivan Ivanov
– Ivan Ivanov, Commented Nov 15, 2017 at 9:20
Possible duplicate of Dynamically access object property using variable — Mark Ormesher
– Mark Ormesher, Commented Nov 16, 2017 at 8:36

Mark Ormesher · Accepted Answer · 2017-11-15 07:10:27Z

6

You're looking for the literal key "id" within your object, not the key at the value of id (i.e. "office"). To get Javascript to treat id as a variable you need to use rooms[id].

The information here explains (towards the bottom) accessing properties of objects: https://www.w3schools.com/js/js_object_definition.asp.

answered Nov 15, 2017 at 7:10

Mark Ormesher

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mohsin · Accepted Answer · 2017-11-15 07:18:09Z

3

You should try this way object[key]

answered Nov 15, 2017 at 7:18

mohsin

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