Referencing a variable when getting object value

Question

If I have a function like this:

var get = function(place, info){
    return places.place.info;
}

and JSON like this:

var places = {
    "london":{
        "distance":50,
        "time":100
    }
}

How can I make the function get return the correct value if I use the following? At the moment it's taking it completely literally:

get("london", "time");

FYI, `places` is a JavaScript object, not JSON. JSON is a textual data exchange format, like XML, YAML, CSV, etc. — Felix Kling, May 01 '13 at 15:42

VisioN · Answer 1 · 2013-05-01T15:46:05.977

2

You should use square brackets notation:

var get = function(place, info){
    return places[place][info];
};

I'd also add some fool proof check, e.g.:

var get = function(place, info){
    return places[place] !== undefined
        && places[place][info];
};

edited May 01 '13 at 15:46

answered May 01 '13 at 15:41

VisioN

score 1 · Answer 2 · answered May 01 '13 at 15:41

1

Use square bracket syntax:

places[place][info]

answered May 01 '13 at 15:41

Rick Viscomi

2 Answers2