Converting Object to Array using ES6 features

I like the old school way:

var i=0, arr=[];
for (var ob in inputObj)
  arr[i++]=ob;

Old school wins the jsperf test by a large margin, if not the upvotes. Sometimes new additions are "mis-features."

just use Object.values

Object.values(inputObj); // => ['foo', [1,2,3], null, 55]

Update August 2020

As a summary, in ES6, there are three (3) variations to convert an Object to an Array as follows:

const MyObjects = {   key1: 'value 1',   key2: 'value 2', };

// Method 1: Converts the keys to Array
// --------------------------------------

Object.keys(MyObjects);
// ['key1', 'key2']

// Method 2 Converts the Values to Array
// --------------------------------------

Object.values(MyObjects);
// ['value 1', 'value 2']

// Method 3 Converts both Values and Keys
// --------------------------------------

Object.entries(MyObjects);
// [ ['key1', 'value 1'], ['key2', 'value 2'] ]

Converting an Array back to an Object can be done as follows:

const array = [  ['one', 1],   ['two', 2], ];

Object.fromEntries(array);

// { one: 1, two: 2 }

Use (ES5) Array::map over the keys with an arrow function (for short syntax only, not functionality):

let arr = Object.keys(obj).map((k) => obj[k])

---

True ES6 style would be to write a generator, and convert that iterable into an array:

function* values(obj) {
    for (let prop of Object.keys(obj)) // own properties, you might use
                                       // for (let prop in obj)
        yield obj[prop];
}
let arr = Array.from(values(obj));

Regrettably, no object iterator has made it into the ES6 natives.