Undefined when parsing data and getting specific objects

Question

I am using leaflet 1.7.1 and successfully loaded JSON file from the local memory of my machine. I have an object which looks like this:

covid = {"AFG":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6},
"KOR":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6},
"KGZ":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6},
....}

What I want to do is to get countries by their ISO country code(e.g. KOR, KGZ etc). Even after converting to object file I cannot get by index like covid[0] but it is not working. I am new to JS and cannot really handle the data.

code · Accepted Answer · 2021-05-30 05:05:58Z

2

Notice it's not called JavaScript Array Notation, but rather JavaScript Object Notation.

The problem: covid is NOT an array. It's an object. Here's a great read. To fix your problem, you refer to the actual name.

To use it in your project, you could loop through the object and use it like so:

for (let isoCountryName in covid) {
  console.log(`${isoCountryName}`);
}

Here's a demo:

var covid = {"AFG":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6},
"KOR":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6},
"KGZ":{"continent":"Asia","location":"Afghanistan","population":38928341.0,"population_density":54.422,"median_age":18.6}};
for (let isoCountryName in covid) {
  console.log(`ISO country name: ${isoCountryName}`);
}

answered May 30, 2021 at 5:05

code

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7 Comments

no name Over a year ago

Should I use Ajax for this? In my console it is showing nothing

no name Over a year ago

Heey, thank you. It worked. The problem was I copied the parsed data into new variable which wasn't really object(wrongly copied). I tried with original parsed object and it worked great!

code Over a year ago

@noname AJAX for what?

no name Over a year ago

I run into another problem which is that isoCountryName is not part of an object anymore. I mean if I have data (eg. isoCountryName.data) in KOR(which is isoCountryName) it return underfined. Is there anything I can do?

code Over a year ago

You can get the entire object under the country like this: covid.AFG or covid["AFG"].

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