使用for循环创建数组的数组

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 ?

Answer 1

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']];
}

Answer 2

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.