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Delegation is a technique that is used in object oriented programming. This is used to show the object and the behavior of the methods that are used. The class can be created to provide an implementation of the method that allows the method to be referenced. The delegate is having the parameter and the return value in an object. It also allows the methods to be passed as parameters and allow the defining of the callback methods that can be grouped together in multiple methods. These methods can be called from a single event. The example shows a class that captures the behavior of the file and converts data from lower to uppercase.
class upcase:
def __init__(self, out):
self._out = out
def write(self, s):
self._outfile.write(s.upper())
def __getattr__(self, name):
return getattr(self._out, name)
The write() method that is used in the upcase class converts the string to the uppercase before calling another method. The delegation is being given using the self.__outfile object.

In spite of all front-end frameworks, React JS is gaining massive popularity with SEO friendly applications and easily understandable methodologies. It was the perfect fit for our needs. The primary reasons for its popularity are as follows:

 
<ul>
<li>Fast Learning Curve</li>
<li>Reusable Components</li>
<li>Quick render with Virtual DOM</li>
<li>Clean Abstraction</li>
<li>Flux and Redux</li>
<li>Great Developer Tool</li>
<li>React Native</li>
</ul>
 

React context is used to pass data through a tree of react components. Using context, we can share data globally between react components.

React supports server-side rendering. Server-side rendering is the process of rendering a web page on the server side than in the browser. It makes the page load time faster. SSR improves the performance, SEO and user experience.

If several states need to share common data, we can lift the state up to its closest common ancestor. That means the child components will not hold any local state, instead, the parent component will hold the common state. This same state will be used by all parent and child components.

props are used to pass data to a component. They can hold single or multiple sets of values to pass to a component. They are mainly used to pass data to a component and to trigger any state changes.