flatten.js

/**
 * Takes a deeply nested object, `source`, and returns an object with
 * dot-separated paths pointing to all primitive values from `source`.
 *
 * Examples:
 *
 *   flatten({ foo: { bar: 1 } })
 *     //=> { 'foo.bar': 1 }
 *
 *    flatten([{ foo: { bar: 1 } }])
 *    // => { '0.foo.bar': 1}
 *   flatten({ foo: [{ bar: 1 }, { bar: 2 }] })
 *     //=> { 'foo.0.bar': 1, 'foo.1.bar': 2 }
 */
function flatten(source,parentKey) {
	return Object.keys(source).reduce((newObject, key, i) => {
		const newKey = parentKey ? `${parentKey}.${key}` : key; 
		if(source[key] && typeof source[key] === 'object'){
			return Object.assign({},flatten(source[key],newKey),newObject);
		}else{
			return Object.assign({},{[newKey]: source[key] },newObject);
		}
	},{});
}