Question

write a function `keyvalueduplicates(obj)` that takes an object as an argument and returns an array containing all keys that are also values in that object.

Answer 1

A function `keyvalueduplicates(obj)` that takes an object as an argument and returns an array containing all keys that are also values in that object is given below:

The Code:

function customFilter(v) {

 return (v.indexOf('c') === 0);

}

function filterValuesByKeys(obj, filter) {

 var ary = [],

     keys = Object.keys(obj);

 keys.forEach(function(k) {

   if (filter(k)) {

     ary.push(obj[k]);

   }

 })

 return ary;

}

var person = {

 name: 'George',

 age: 50,

 address: '1 center st',

 city: 'some city',

 state: 'some state',

 country: 'USA'

};

var result = filterValuesByKeys(person, customFilter);

console.log(result);

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