How to filter Object using Array.prototype.filter?

Question

Given

var arr = [1,2,true,4,{\"abc\":123},6,7,{\"def\":456},9,[10]]

we can filter number items within array arr using N

Answer 1

Without passing a callback function, you can instead pass in a regex by using the RegExp.prototype.test method and binding a regex

var arr = [1,2,true,4,{"abc":123},6,7,{"def":456},9,[10]]

var res = arr.filter(RegExp.prototype.test.bind(/\[object Object\]/));

console.log(res)

This would match any string containing [object Object] as well, but it seems highly unlikely that a string would contain those exact words, unless you have made a mistake and included stringified objects in your array.