Object to array

objectToArray.js

let delimiter = ':';

Object.keys(obj).reduce((a, b) => {
      return obj[b] !== undefined ? a.concat(b + delimiter + obj[b]) : a;
}, []);

class whatever {
   objectToArray(obj, separator) {
        let delimiter = separator || ' ' ;
        return Object.keys(obj).reduce((a, b) => {
        	return obj[b] !== undefined ? a.concat(b + delimiter + obj[b]) : a;
        }, []);
    }
}