Create an array of arrays using for loop

Question

My goal is to create an array that look something like this

var locations = [
    [
        "New Mermaid",
        36.9079,
        -76.199
    ],
    [
        "1950 Fish Dish",
        36.87224,
        -76.29518
    ]
];

I've tried

var data = $locations;
var locations = [];

for (i = 0; i < data.length; i++) {

  locations[i] =
  data[i]['name']+','+
  data[i]['lat']+','+
  data[i]['lng'];

}

console.log(locations);

I've got

["Apple  HQ,33.0241101,39.5865834", "Google MA,43.9315743,20.2366877"]

However that is not the exact format.

I want

var locations = [
    [
        "New Mermaid",
        36.9079,
        -76.199
    ],
    [
        "1950 Fish Dish",
        36.87224,
        -76.29518
    ]
];

How do I update my JS to get something like that ?

Why do you want an array that contains arrays that each contain 1 string? — Cerbrus
– Cerbrus, Commented Feb 1, 2016 at 19:17
That is not an object. An object would be: {company: 'Apple HQ', lat: '33.024', long: '39.586'}. — random_user_name
– random_user_name, Commented Feb 1, 2016 at 19:20
Sorry, I might have upload the wrong format. I updated my post. Thanks for poiting that out. — code-8
– code-8, Commented Feb 1, 2016 at 19:20
You want an array of arrays. Build the array first, then append it to your master array. — random_user_name
– random_user_name, Commented Feb 1, 2016 at 19:21

random_user_name · Accepted Answer · 2016-02-01 19:22:38Z

3

To build an "Array of arrays", this is one (of a few different methods):

for (i = 0; i < data.length; i++) {
  locations[i] = [];
  locations[i][0] = data[i]['name'];
  locations[i][1] = data[i]['lat'];
  locations[i][2] = data[i]['lng'];
}

or

for (i = 0; i < data.length; i++) {
  locations[i] = [data[i]['name'], data[i]['lat'], data[i]['lng']];
}

answered Feb 1, 2016 at 19:22

random_user_name

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Comments

Jonas Meinerz · Accepted Answer · 2016-02-01 19:27:12Z

3

var locations = data.map(function(location){
  return [ location.name, location.lat, location.lng ];
}

Map will make an array with all the returned values from your function. Each return will be an array consisting of the 3 attributes you are looking for.

edited Feb 1, 2016 at 19:27

answered Feb 1, 2016 at 19:23

Jonas Meinerz

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2 Comments

random_user_name Over a year ago

Very nice! Great solution.

Amberlamps Over a year ago

Rather this: return [ location.name, location.lat, location.lng ];

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Create an array of arrays using for loop

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