JavaScript 2 dimension array

Question

I have 3 arrays

var city = [
 ['Kaunas', 54.896872,23.892426],
 ['Vilnius', 54.711136,25.280685],
 ['Klaipeda', 55.720149,21.131401],
 ['Utena', 55.536403,25.59494],
];
var lake = [
 ['Ezeras Bijote', 55.785092,23.062956],
 ['Ezeras Druksiai', 55.627996,26.565228],
 ['Ezeras Sartai', 55.804368,25.832863],
 ['Ezeras Metelys', 54.300299,23.767004],
];
var shop = [
 ['Kauno Akropolis', 54.891665,23.917744],
 ['Panorama', 54.709549,25.257454],
 ['Europa', 54.687514,25.262886],
 ['Ozas', 54.638628,25.135685],
];

I want add this 3 arrays to 1 array ut don't know how to do this, will very nice if i can call form alements like this bigArr[city][1], bigArr[shop][1],bigArr[lake][1]

Answer 1

Using what you already have:

var bigArr = {"city": city, "lake": lake, "shop": shop};

• Tom Pietrosanti: bigArr["city"][0] is the same as city[0]
• Tom Pietrosanti: You can also use bigArr.city[0]

Answer 2

You may be interested in compact().

Alternatively, just declare it as an object already:

var myObject = {
 city: [
 ....
 ],
 lake: [
 ....
 ],
 shop: [
 ....
 ]
};

Answer 3

You should use Objects instead of Arrays. You can access them by string keys. Create them as a literal:

var coordinates = {
 "city": {
 Kaunas: [54.896872,23.892426],
 Vilnius: [54.711136,25.280685],
 Klaipeda: [55.720149,21.131401],
 Utena: [55.536403,25.59494]
 },
 "lake": {
 ...
 },
 "shop": {
 ...
 }
}

Then access their properties by using member operators:

• Dot notation: coordinates.shop
• Bracket notation: coordinates["lake"]

To get the coordinates array for Utena, you might use coordinates.city["Utena"]

Answer 4

You might want to create an object instead of a multidimensional array -

var bigArr = {
 "city": {
 Kaunas: {
 "lat": 54.896872,
 "lon": 23.892426 
 },
 Vilnius: {
 "lat": 54.711136,
 "lon": 25.280685
 },
 Klaipeda: {
 "lat": 55.720149,
 "lon": 21.131401
 },
 Utena: {
 "lat": 55.536403,
 "lon": 25.59494
 }
 },
 "lake": {
 ...
 },
 "shop": {
 ...
 }
}

And then you can use it, like bigArr.city.Kaunas.lat

• Bergi: Never store numbers as strings!