Concat several arrays in JavaScript (nodejs) -

what more concise way concat ar arrays in following object:

var obj = {   field1: {     ar: [...]   },   field2: {     ar: [...]   },   ...   fieldn: {     ar: [...]   } }

i found this:

object.keys(obj).reduce(function(array, entry) {   return array.concat(obj[entry].files); }, []);

you may try this:

[].concat.apply([], [array1, array2, ...])

My