Is there a static equivalent of instanceof? I.E., rather than: obj1 instanceof Type something like: TypeA instanceof TypeB? I couldn’t find anything on the matter, so I hacked together this: function InstanceOf(type,parent) { do{ if(type === parent) return true;} while(type = Object.getPrototypeOf(type)); return false; } //… Instanceof(ChildClass, ParentClass); // = boolean But I feel like… Read More Is there a static version of `instanceof`?

In mdn’s doc’s for the prototype chain, it states All objects inherit the Object.prototype.__proto__ setter, which can be used to set the [[Prototype]] of an existing object (if the __proto__ key is not overridden on the object). It then goes on to say that Object.prototype.__proto__ accessors are non-standard and deprecated. You should almost always use… Read More Mdn Docs __proto__ vs __proto__ Accessor

let obj1 ={ fName : ‘Ayush’, lName : ‘Singh’, city: ‘Asansol’, getName : function(){ console.log(`I am ${this.fName} ${this.lName} from ${this.city}`) } } let obj2 = { fName : ‘Aman’ } obj2.__proto__ = obj1; console.log(obj1.getName()) obj2.getName() console.log(obj2.__proto__.getName()) console.log(obj1.__proto__.getName()) Here I am trying to check how proto works. Why can’t I access of obj1.proto.getName >Solution : Deprecated:… Read More Can anyone help me to undrstnd the output of the below code

I was reading about the new keyword in javascript on MDN and came across this line: When a function is called with new, the constructor’s prototype property will become the resulting object’s prototype. However, the code below didn’t behave as I would expect. I assumed that Car.prototype would return the Car’s prototype object. But it… Read More Getting the prototype of a constructor in javascript

So, I’ve never done this before, trying to add a method to the Array.prototype. See console.log statement below for usage. It keeps telling me the method is not defined. I can’t figure out what I’m doing wrong. Help! My best conclusion / guess so far is that "this" is referring to the global object, and… Read More Javascript Custom Array.prototype.method logs 'not defined'