Fetch nested object property using lodash

Question

I've a nested object with a country code. I need to fetch the corresponding currency property using lodash based on the condition.

I'm a newbie to lodash and not sure which method can I use here.

For e.g., When I search for corresponding currencies for the countryCode 'AU', it should return 'AUD'.

Currently, I get the entire object.

How do I get this done?

var myJSON = {
  "countryCode": {
  "Australia": "AU",
  "United States": "US",
  "Britain": "GB",
  "Japan": "JP",
  "India": "IND",
  "France": "FR",
  "Russia": "RS"
},
"countries": {
  "AE": {
    "currencies": {
    "AED": {
      "isDefault": true
    }
    }
  },
  "AL": {
    "currencies": {
    "ALL": {
      "isDefault": true
    }
    }
  },
  "AU": {
    "currencies": {
    "AUD": {
      "isDefault": true
    }
    }
  },
  "US": {
    "currencies": {
    "USD": {
      "isDefault": true
    }
    }
  },
  "GB": {
    "currencies": {
    "EUR": {
      "isDefault": true
    }
    }
  },
  "FR": {
    "currencies": {
    "EUR": {
      "isDefault": true
    }
    }
  },
  "JP": {
    "currencies": {
    "JPY": {
      "isDefault": true
    }
    }
  },
  "RS": {
    "currencies": {
    "RSD": {
      "isDefault": false
    }
    }
  },
  "ZA": {
    "currencies": {
    "ZAR": {
      "isDefault": true
    }
    }
  }
  }
};

function getData() {
 var countryCode = ['AU', 'ZA', 'JP'];
 console.log(_.pick(myJSON.countries, countryCode));
 console.log(_.values(_.pick(myJSON.countries, countryCode)));	
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>
<button onclick="getData()">Get Data</button>

Current Output: {AU: {…}, ZA: {…}, JP: {…}}

Desired Output:

['AUD', 'ZAR', 'JP']

Here's the code:

score 2 · Accepted Answer · 2018-02-21 10:17:16Z

2

The lodash way to do it looks like that:

function getData() {
 var countryCode = ['AU', 'ZA', 'JP'];
 console.log(
   _(myJSON.countries)
    .pick(countryCode)
    .values()
    .map(function(value) { return _.keys(value.currencies)[0]; })
    .value()
 );	
}

edited Feb 21, 2018 at 10:17

answered Feb 21, 2018 at 9:37

user923679

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4 Comments

Sunny Over a year ago

Thanks, but that is giving me countryCodes. I need the currencies.

user923679 Over a year ago

Ah, true. Gonna change in in a sec

user923679 Over a year ago

I misunderstood it, because of the "Desired Output: ['AUD', 'ZAR', 'JP']"

Sunny Over a year ago

Yes, that's how it is supposed to display as per the desired output. But, what I get with your solution is exactly the same as CountryCode.

gurvinder372 · Accepted Answer · 2018-02-21 09:30:18Z

1

When I search for corresponding currencies for the countryCode 'AU', it should return 'AUD'.

Try this vanila js solution as well, use map

var countryCode = ['AU', 'ZA', 'JP'];
var output = countryCode.map( s => Object.keys( myJSON.countries[ s ].currencies[ 0 ] ) );

answered Feb 21, 2018 at 9:30

gurvinder372

68.6k11 gold badges78 silver badges98 bronze badges

5 Comments

user923679 Over a year ago

Unfortunately, this code won't work in old browsers.

gurvinder372 Over a year ago

@Alex due to arrow functions?

user923679 Over a year ago

Yep, Object.keys and array.map won't work in olders IEs as well :(

gurvinder372 Over a year ago

How old are we talking about? map and Object.keys are quite old!

user923679 Over a year ago

Like in IE8 :D. Actually I like your answer, it should work in 95% of cases, I gave another answer, just only because lodash was already mentioned (and it looks prettier MHO).

codeofnode · Accepted Answer · 2018-02-21 09:23:47Z

0

Pick will do what its asked to do.

Instead do this :

countryCode.map((ct) => Object.keys(myJSON.countries[ct].currencies)[0]);

answered Feb 21, 2018 at 9:23

codeofnode

18.7k31 gold badges90 silver badges147 bronze badges

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