Solutions on MaxInterview for instanceof by the best coders in the world

showing results for - "instanceof"
Juan Pablo
25 Jun 2016
1if ( !(obj instanceof Array) ) {
2  console.log('obj is not an Array')
31 Sep 2017
1An instanceof in Java is a comparison operator which, given an object instance, 
2checks whether that instance is of a specified type (class/sub-class/interface) 
3or not. Just like other comparison operators, it returns true or false.
5Comparing any object instance with a null type through instanceof operator 
6returns a false.
8Instanceof operator is used to test the object is of which type.
10Syntax : <reference expression> instanceof <destination type>
11Instanceof returns true if reference expression is subtype of destination type.
12Instanceof returns false if reference expression is null.
10 Apr 2018
1var color = "red";
2var color2 = {};
3color instanceof String // will return true
4color2 instanceof Object // will return true
08 Nov 2020
1The instanceof operator tests to see if the prototype property of a constructor 
2appears anywhere in the prototype chain of an object. The return value is a 
3boolean value.
4For example :-
6function Car(make, model, year) {
7  this.make = make;
8  this.model = model;
9  this.year = year;
11const auto = new Car('Honda', 'Accord', 1998);
13console.log(auto instanceof Car);
14// expected output: true
16console.log(auto instanceof Object);
17// expected output: true
02 Feb 2018
1new Date() instanceof Date;  // => true
28 Jan 2019
1function Phone(serial, price, color){
2  this.serial = serial;
3  this.price = price;
4  this.color = color;
7let phone1 = new Phone('abc1', 200, 'red');
8let phone2 = new Phone('abc2', 400, 'green');
11console.log(phone1 instanceof Phone) // true
14console.log(phone1.constructor === Phone) //true
queries leading to this page
object instanceofinstanceof 28 29 javascriptjavascript check if object is instance of classinstanceof class jsjavascript test object of classisinstance jstypeof and instanceofinstanceof elementjavascript check instanceofinstanceof operator javacheck if variable is instance of classinstanceof list javascriptif instanceof jshow to check if an object is an instance of a calss in jsjava x is not instanceofhow to past instanceofuse instanceof javawhat is the use of c2 a0instanceof operator c2 a0in java 3f explain with help of any example also explain in your own words instanceof javascript w3schoolsinstace of javahtml instanceof arrayinstanceof method in javaobject instance of javajs check if you have the classinstanceof in methodjavascript instanceof in oopcheck java instance ofinstanceof string returns falseinstanceof js stringnode instanceof numberjs instance ofinstanceof object 5b 5dinstanceof object jsinstanceof object in reactjswhat does instanceof return 3f 2ajavascript instanceof examplecheck instance of class javascriptinstanceof and typeof in javascripthow to check t instanceof employee class in javainstanceof dom javascripttypeof vs instanceof jscheck if there is a class jsjavaa instance ofinstanceof functioninstace of in jsjs instanceof objectinstanceof object in jswhat is the use of c2 a0instanceof operator c2 a0in javacheck if instanceof check instanceof javascriptcheck class instance jsjs if check there is a classcheck if object is of classinstance of object javascripthow to check if object is not instanceofjava instance of stringnode js cjecl if object extends classjs check if object is instance of classjava typeof examplecheck class instancejavascript check if instance is functionjs if instanceofjs check class of objectjavascript check if classinstanceof operator in java oraclejavascript check type of classinstance of javscriptinstanceof jsvascriptjs instanceof variableinstanceof not javascripthow to check an instance javascriptinstance of in javajavascript instanceofinstanceof operator in jsinstanceof javascript objectjavascript is not instanceof stringjava instance ofcheck if not instance of javascriptjavasctipt instanceofjava 21istanceofnot a instance of jswhat instanceof jsjavascript how to know is instance of classjavascript check if class is object instanceof jsinstanceof in javascriptinstanceof android javaif instanceof class javascriptinstanceof array javascriptinstanceof keyword in javascriptinstance of havainstanceof error javascriptis instance of javadid of instance javascriptjavascript type instanceofisntanceof javawhat is 22instanceof 22 an example ofinstance of a in jsuse of instanceof operator in javajava instance of operatorjavascript instanceof intefaceinstanceof in javascrpitis not instanceofinstanceof is it neededin or instanceof jsinstanceof jsjs if check theres a classcheck if div class jsobject instanceof objectnode js instanceofjs instanceof intinstanceof java exampleinstanceof newthe operator e2 80 9cinstanceof e2 80 9d determines if an object has what 3fjavascript check if object is a classjava script instanceofjs check if object is of classjavascript is not instance ofcheck if is instance of class jsjavascript instanceof a java classinstanceof javascriptwhat is instanceof method in java and how to useverify class object jsis instance of in jscan you case instance javascripthow to console log instanceofinstanceof classjavascript test if an object is of a particular class typeobject instanceofinstanceof classwhat is the use of instanceof operator in javainstanceof datahow to check js instance at browserjs instanceof not workinginstanceof examplejava instanceof operatorjavascript instanceof numberjs if not instanceofsee if an element is an a class jsts instanceoftypeof and instanceof in javascriptreturn t instanceofinstanceof vs typeof javascriptes6 instance ofjs instanceof vs typeofjava instoceofjavascript not instanceofinstanceof javascript not workinginstanceof int javascriptinstanceof numberjs check if object is a type of classvalue instance of objectobject not an instance of class javascriptif object is a class jsuse instanceof for instancehow to check if an object is instance of a classjavascript instanceof with typeswhat is instance of in javajava instance methodreturn instanceofjs error instanceofinstanceof 28element 29 in typescripthow to check instance of string in javascripttext data instanceofinstance block inside a method javainstanceof nodejsnot instance of javascriptinstance of syntax in javascriptnode instance checkinstanceof js js instanceof operator jsjavscript instance ofinstance of operator javahow to check instance of object in javascriptcheck if e is an instance of a class instanceof funcitonchech type of moedel jsisinstanceof javawhich are the correct arguments to the instanceof operator 3f 2ainstanceof in javascript w3schoolsnode check if variable is classhow to check if its an instance of class jsjavascript object instanceofinstanceof function javascriptinstanceof void jsinstance of javascroiptinstance of javacriptwhen to use instanceof and type of in jsthe instanceof javascriptinstance of method javascrithow to past instanceof javascriptinstanceof meaningjavascript instanceof on objecttypescript instanceofinstanceof java 5cwhat does the instanceof operator return in javainstance of javascriptinstance of javasachecking if a variable is an instance of any classif not instanceof javascriptjs instance of object is true for function 2c how to detect functionjs instanceof 28 29get instanceof instanceofjs typeof vs instanceofpython how to add an instance of an object to a list when it is cratedhow to check how many instance of a class in javascriptuse of instanceof in javainstanceof method in javascriptbe instanceofcheck if object instance of class jscheck instanceof by name javascriptjavascript typeof classinstanceof operator in javaget if object is class js 7b 7d instanceofjs see if object is a classelement instanceof negation of instanceofhow to use instanceofif instanceof javascript else return thistypeof or instanceofget what an object is an instanceof instanceof keyword in javajavascript value instance of object is falsejavascript instanceof vs typeofjs check value is instance of classjs check if is instance of classjavascript instanceof filecheck if is class jsinstanceof function in javascriptjavascript how does instanceof workinstance of number javascriptjavascript get instanceofjavascript type of node instanceofjavascript instanceof object literalinstance of method javascripthow to check if object is a specific class in javascriptjavascript is instance ofjs check value on class creation what is instanceof in javathis instanceof javascriptisinstanceof 28 29 javats check if object is instance of classwhat does instanceof dois instanceof a keyword in javascriptjs instanceof negationjavascript instanceof operatorjs instanceof stringjs check if variable is a classint with instanceof operator in javajavascript instance of objectinstanceof in opp javascriptjs class check if new instancecheck if class avalable jsjs instanceof notinstanceof in javascript educbainstanceof javawhat is instanceof in javascriptis instanceofwhat does instanceofnegative instance of javainstanceof arrays javascript stringcan i check an object is instance of list in javascriptjs check if instance of classjavascript instanceof stringjs html element instanceofinstanceof arrayinstanceof javascript stringes6 instanceofjavascript class instanceofinstanceof in javaschow to check if an object is a certain classjava instanceofhow to use instanceof in jsinstance of meaning javaif instanceof javascriptjs object instance ofusing instanceof in javascriptexplain about instanceof operator in javajavascirpt check if instance ofcheck object instance of classinstanceof 28stringjavascript typeof vs instanceofhow to check if class exists in javascriptjavascript instanceof objectjavascript if instanceofa instanceof function jsjavascipt instanceofjavascript check object syntaxjs check class instancejavascript check class of objectinstanceof node jsintance of javascriptcheck instance of object is trueinstanceof number jscheck if object is of type classinstance of 2cmeaning javaisinstance javascriptjs if object is classnot instanceofdefine instanceof javainsanceofcheck if its a object of class js instanceofwhat is the use of instance of operator in java 3fjava is instance ofinstanceof js5instanceoff javatype instance of jsinstanceof thischeck if an object is of a class jsinstanceof objecttest type of object javascriptjava class instanceofcheck instance of javascriptinstanceof javascript explaineedcheck if object is classinstanceof mthodnot instanceof sinstanceof javascript not if type of model jsinstanceof operatorjavascript arguments list check instance ofinstanceof object javascriptwhich are the correct arguments to the instance of operator 3f in javainstanceof in jsinstance of object in javascriptjavascript instance ofjavascript instanceof integerjs is instance of classjavascript instanceof when do usejs check if class 22instanceof object 22javascript instanceof checkjava instance of operatorsjavascript log instanceofjs instancepofhow to check if a instance of a class is a certain valuehow to check if object is of type classcheck if object is instance of class javascriptinstanceof javasciprttypescript check if is istanceoftypeof instanceofjavascript check if object instanceofhe object is an instance of the specified type java meaningistance of javats not instanceofnot instanceof javanode instanceof 21instanceof jsinstanceof number javascriptjs check instanceofinstance of in jsinstance of operator in jacainstance ofcheck object instance javascriptjavascript check if instance of classjs instanceofhow to check if an object is instance of a class in typescript 22 22 instanceof stringobject instanceof function 26 26 function instanceof objectaiinstanceof htmlnot instanceof jsjava negate instanceofcompare class types javascritpwhat does instanceof do in javais instanceof javascriptjs check if error is not instanceofinstanceof java usagets check if object belongs to classjavascript check if instance of 22string 22 instanceof string 3bwhat does instanceof do javascriptinstance of in javascriptjs class return string if instancejava instanceof keywordjavascript instanceof typejs get instanceofinstanceofwhat is the instanceof operator in javascriptcheck if class object is inastance oftypescript not instanceofclass if class type jscheck if object is of class javascriptcheck if e is of classinstanceof function jsinstance of javawhat does instanceof return 3fhow does instanceof workinstanceof with javascript objectmdn instanceofinstanceof example ofinstanceof jsjavascript check instance ofhow do you check if an object is an instance of a particular classhow to check if object sis fo class typescriptnodejs check if classjavascript test object typeis not instanceof javascriptinstanceof javascript examplehow to use instanceof in javascriptjs how to do not instance ifuse instanceof in javawhat does instanceof used for in javascriptinstanceof 28 29string instance of javascript 7e javascript instanceofinstanceof in javais instanceof typescript how it works on javascriptjs check instance ofalternative of instanceof operator in javacheck if object is class javascriptinstance of exampleknow instance of javascriptjs how to check what class an object is an instance ofcheck if a variable is a class in javascriptcheck for not an instance of in jsvar instanceof number jsjs a instanceof stringjavascript instanceof as stringinstanceof js in class check if variable is of a particular class type javascriptsyntax instanceof stringis not instance of javascriptnot instance of javainstanceof 28 29 javawhat does instanceof return in javascriptif object is class jsinstanceof stringinstanceof keywork belongs to aparticularjs instanceof examplehow to check if instance of a classwhat does instanceof do in javascriptcheck if is class javascriptjavascript instanceof window objectjs output instanceofjs instanceof functioncheck if type is class jstypeof vs instanceof javascriptinstanceof javscripthow to check in js if instnceofcheck instance of object nodejsinstance of object is truejs isinstaneinstanceof js exampleget instanceof class javatypescript if not instanceofdifference between instanceof and typeof in javascripthow to see what the data is an instanceof in javascriptinstance of function javascriptinstance of jsinstanceof conditionjavascript determine if classjavascript not instance ofjavascript is instaceinstance jshow to know if variable is instance of a class in jsinstanceof string javascriptinstanceof operator in javascript exampleinstance of in javacsripinstanceof object in javascriptis instance of java scriptinstanceof object equivalent in reactjsinstanceof in jsjavascript check if variable is instance of classcheck if class has instancejavascript instance of object definitionunderstanding instanceof operator in javahow does instanceof work in javainstance of operatorcheck if instance is of type class objectcheck instanceofjs not instanceofjs not instance ofnot instanceof javascriptjavascript instaceofinstanceof 29is a new object instanceof object in javascripthow to use java instanceofusing instance of in javajs instanceof operatorinstanceof negationjavascript instanceof in ifjava not instanceofhow to check if a class is there in certain element in jsinstanceof 2bjsjs instanceof integerinstanceof in javascript programizis instance javascriptjavascript instanceof 28 29js check if instance or classjavascript check if object instance classjavascruipt instanceofnot instance ofhow to check if an object is an instance of a class javascriptinstanceof htmlcheck if object is of class jsjavascript check if variable is classinstance of in javascriptjs check if object is of typehow to check if an object is an instance of javascript built in objecthow to check if an instance is a type of a classwhat is the instance of in javascriptjava instanceof examplenodejs function argument as instanceofjs instnaceofcheck if object is an instance of a classinstanceof on opp jsjavascript instance ofddoes an object check instance of class 3finstance of node jswhat is the use of instanceof operator in java 3f explain with help of any example also explain in your own words javascript paramter is instance of classjavascript instanceof functioncheck if object is instance of class typescriptclass of instanceofinstanceof operator in javascriptjavscript instanceofis instance of jsinstanceofin javascriptcheck if an object is an instacne of a class jsjs if function is classinstanceof typeofinstance of operator in javajavascript check object instance of classjavascript instantofwhat is the use of instance of operator in java instanceof typehow to get correct instanceof jsinstanceof javais 27instanceof