->What are closures in Javascript? ->Explain Hoisting in Javascript. ->Difference between Promises and async await . ->What is callback hell ? ->Difference between call, bind and apply. ->Write the polyfill for call, bind, apply, promise.all() . ->Explain the working of setTimeOut() completely , how callback is registered in web services to the point it reaches Call Stack . -> "const" variable are mutable or immutable? -> Difference between var,let and const -> What are different positions in css? -> What are different measuring units in css and explain the difference between them? -> What is Canvas in HTML ? -> What are the different ways of testing your FE application? -> What are the different ways of improving the performance of your application.
