What is the reason for wrapping the entire contents of a JavaScript source file in a function that is immediately invoked? Answer This technique is very common in JavaScript libraries. It creates a closure around the entire contents of the file which creates a private namespace and thereby helps…
What is a closure? Can you give a useful example of one? Answer A closure is a function defined inside another function and has access to its lexical scope even when it is executing outside its lexical scope. The closure has access to variables in three scopes: Variables declared in its own scope…
What is event delegation and why is it useful? Can you show an example of how to use it? Answer Event delegation is a technique of delegating events to a single common ancestor. Due to event bubbling, events “bubble” up the DOM tree by executing any handlers progressively on each ancestor element up…
According to Gatsby documentation, you can use wrapRootElement to wrap your application with provider components and wrapPageElement to wrap your pages with components that won’t get unmounted on page change. But that explanation begs the question: why we don’t do both with , and instead, we need…
It can be confusing when you get started in applied machine learning. There are so many terms to use and many of the terms may not be used consistently. This is especially true if you have come from another field of study that may use some of the same terms as machine learning, but they are used…
