JAVASCRIPT

check if object values contains string node js

let exists = Object.values(obj).includes("test1");

check if an object contains a value in javascript

var obj = { a: 'test1', b: 'test2' };
if (Object.values(obj).indexOf('test1') > -1) {
   console.log('has test1');
}

check if object has method javascript

if(typeof myObj.prop2 === 'function') {
    alert("It's a function");
} else if (typeof myObj.prop2 === 'undefined') {
    alert("It's undefined");
} else {
    alert("It's neither undefined nor a function. It's a " + typeof myObj.prop2);
}

Check If Object Contains A Function

 
		 const res = {a:"aaa", b:function(){console.log("b")}};
	 
	 console.log(typeof res.b == "function");
	 /*true, notice it is b and not b()*/