A few ways to get undefined such as not assigned variable’s value, not passed the function parameter, and searched non-existing array elements.
Null means an empty or non-existent value. Null is assigned and explicitly means nothing.
Double equal(‘==’) only compares…
DOM represents Document Object Model. The Virtual DOM is the programming concept where virtually represents a UI stored in memory and renders or synced with Real DOM by a React DOM library. It’s called reconciliation.
When React renders tree elements in the browser it first generates virtual…