how to check if var is object js code example

Example 1: javascript check if variable is object

let myObject = {
	firstname: 'harry',
  	lastname: 'potter'
}
//check the typeof if, boolean, object, string etc...
console.log(typeof myObject);
if(typeof myObject === 'object') {
	console.log('this is object');
}

Example 2: javascript check if is object

obj = {
	"data": 123
}
arr = [
	"data", 
	123
]

function obj_or_arr(val) {
	if (typeof val === "object") { // return if is not array or object
		try {
			for(x of val)  // is no errors happens here is an array
				break;
			return "array";
		} catch {
			return "object"; // if there was an error is an object
		}
	} else return false; 
}

console.log(obj_or_arr(obj)) // object
console.log(obj_or_arr(arr)) // array
console.log(obj_or_arr(123)) // false
console.log(obj_or_arr("hello world")) // false
console.log(obj_or_arr(true)) // false
console.log(obj_or_arr(false)) // false

Example 3: javascript check if variable is object

//checks if is object, null val returns false
function isObject(val) {
    if (val === null) { return false;}
    return ( (typeof val === 'function') || (typeof val === 'object') );
}
var person = {"name":"Boby Snark"};
isObject(person);//true