How to access a specific property within a nested but fixed structure of arrays and objects

Question

This is my array

let result=[
  { lon: -122.08, lat: 37.39 },
  [ { id: 800, main: 'Clear', description: 'clear sky', icon: '01d' } ],
  'stations',
  {
    temp: 282.55,
    feels_like: 281.86,
    temp_min: 280.37,
    temp_max: 284.26,
    pressure: 1023,
    humidity: 100
  },
  16093,
  { speed: 1.5, deg: 350 },
  { all: 1 },
  1560350645,
  {
    type: 1,
    id: 5122,
    message: 0.0139,
    country: 'US',
    sunrise: 1560343627,
    sunset: 1560396563
  },
  -25200,
  420006353,
  'Mountain View',
  200
]

I want to fetch icon property, so I tried this

for (let i in result) {
    if (i == 1) {
        console.log(result[i]['icon']);
    }
}

But I got "undefined" as an output. please help me access the icon property in this array.

BTW ... how the array is filled is pretty unusual. The result items look like they are originally the values of an object's properties. Thus, if the object was known one hypothetically could write obj.<propertyName>[0].icon — Peter Seliger
– Peter Seliger, Commented Sep 15, 2021 at 11:47

DecPK · Accepted Answer · 2021-09-15 11:27:08Z

1

It is not recommended to use for..in with arrays. As result is an array, then you can use index to fetch the icon property as:

result[1][0].icon

let result = [
  { lon: -122.08, lat: 37.39 },
  [{ id: 800, main: "Clear", description: "clear sky", icon: "01d" }],
  "stations",
  {
    temp: 282.55,
    feels_like: 281.86,
    temp_min: 280.37,
    temp_max: 284.26,
    pressure: 1023,
    humidity: 100,
  },
  16093,
  { speed: 1.5, deg: 350 },
  { all: 1 },
  1560350645,
  {
    type: 1,
    id: 5122,
    message: 0.0139,
    country: "US",
    sunrise: 1560343627,
    sunset: 1560396563,
  },
  -25200,
  420006353,
  "Mountain View",
  200,
];

const res = result[1][0].icon;

console.log(res);

answered Sep 15, 2021 at 11:27

DecPK

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