Example A

Question

-3

How to get all keys with values from nested objects

rated 0 times [ 4] [ 7] / answers: 1 / hits: 30043 / 7 Years ago, wed, november 1, 2017, 12:00:00

I'm looking for something kind of like Object.keys but that works for potentially nested objects. It also shouldn't include keys that have object/array values (it should only include keys with immediate string/number/boolean values).

Example A

Input

{

   check_id:12345,

   check_name:Name of HTTP check,

   check_type:HTTP

}

Expected output

[

  check_id,

  check_name,

  check_type

]

Object.keys would work for flat cases like this, but not for nested cases:

Example B

Input

{

   check_id:12345,

   check_name:Name of HTTP check,

   check_type:HTTP,

   tags:[

     example_tag

   ],

   check_params:{

      basic_auth:false,

      params:[

        size

      ],

      encryption: {

        enabled: true,

      }

   }

}

Expected output

[

  check_id,

  check_name,

  check_type,

  check_params.basic_auth,

  check_params.encryption.enabled

]

Note that this does not include tags, check_params, check_params.params, or check_params.encryption since these values are arrays/objects.

The question

Is there a library that does this? How would you implement it so that it can work with any object, large and nested, or small?

Answers

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gianni

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3 Years ago

answered 7 Years ago ellisw · Accepted Answer

You could use reduce like this:

const keyify = (obj, prefix = '') => 

  Object.keys(obj).reduce((res, el) => {

    if( Array.isArray(obj[el]) ) {

      return res;

    } else if( typeof obj[el] === 'object' && obj[el] !== null ) {

      return [...res, ...keyify(obj[el], prefix + el + '.')];

    }

    return [...res, prefix + el];

  }, []);



const input = {

   check_id:12345,

   check_name:Name of HTTP check,

   check_type:HTTP,

   tags:[

     example_tag

   ],

   check_params:{

      basic_auth:false,

      params:[

        size

      ],

      encryption: {

        enabled: true,

        testNull: null,

      }

   }

};



const output = keyify(input);



console.log(output);

Edit1: For the general case where you want to include arrays.

const keyify = (obj, prefix = '') => 

  Object.keys(obj).reduce((res, el) => {

    if( typeof obj[el] === 'object' && obj[el] !== null ) {

      return [...res, ...keyify(obj[el], prefix + el + '.')];

    }

    return [...res, prefix + el];

  }, []);



const input = {

   check_id:12345,

   check_name:Name of HTTP check,

   check_type:HTTP,

   tags:[

     example_tag

   ],

   nested: [

      { foo: 0 },

      { bar: 1 }

   ],

   check_params:{

      basic_auth:false,

      params:[

        size

      ],

      encryption: {

        enabled: true,

        testNull: null,

      }

   }

};



const output = keyify(input);



console.log(output);