How to filter an object with its values in ES6

Question

What is the best way to filter an object this way in ES6?

Starting data:

const acceptedValues = [\"value1\",\"value3\"]
const myObject = {
    prop1:         


        

Answer 1

Just to build on top of @Nenad Vracar good answer you could use an object instead of the Array with includes for faster lookup:

const acceptedValues = ["value1", "value3"];
const myObject = {
  prop1: "value1",
  prop2: "value2",
  prop3: "value3"
};

const lookup = acceptedValues.reduce( (memo, prop) => {
  memo[prop] = true;
  return memo;
});

const filteredObject = Object.keys(myObject).reduce((filtered, key) => {
  if(lookup[myObject[key]]){
    filtered[key] = myObject[key];
  }
  return filtered;
}, {});

console.log(filteredObject);

Nor that the includes doesn't do the job, but I thought to provide an alternative view.

Answer 2

Using a simple for loop and get object by key.

const acceptedValues = ["value1","value3"]
const myObject = {
    prop1:"value1",
    prop2:"value2",
    prop3:"value3"
}

Object.prototype.getKeyByValue = function( value ) {
    for( var prop in this ) {
        if( this.hasOwnProperty( prop ) ) {
             if( this[ prop ] === value )
                 return prop;
        }
    }
}

for (var i in acceptedValues) {
  if (myObject.getKeyByValue(acceptedValues[i])){
    console.log(acceptedValues[i]);
  }
}