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interface having all abstract methods and doesnt have imp;ementation

interface has only declaration part only not definition part
is not there,

To work with javascript in ASP.NET, the best way to do it,
is using the Page.ClientScript object at some point.
For instance, if you want to show an alert box when the
page is finished loading, use this:
string javascript = "alert('Finished loading!');"
Page.ClientScript.RegisterStartupScript(typeof
(string), "key", javascript,true);
The ClientScript object has other methods, like
RegisterClientScriptBlock, RegisterClientScriptInclude,
RegisterExpandoAttribute and so on, which all allow you to
add javascript to the page in different ways.

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.

There are generally two approaches to changing data. The first approach is to mutate the data by directly changing the data’s values. The second approach is to replace the data with a new copy which has the desired changes.

<p id="de26" class="graf graf--p graf-after--p">This relates to stateful DOM components (form elements) and the difference:</p>

<ul class="postList">
<li id="e12c" class="graf graf--li graf-after--p">A <strong class="markup--strong markup--li-strong">Controlled Component</strong> is one that takes its current value through props and notifies changes through callbacks like onChange. A parent component “controls” it by handling the callback and managing its own state and passing the new values as props to the controlled component. You could also call this a “dumb component”.</li>
<li id="dee2" class="graf graf--li graf-after--li">A Uncontrolled Component is one that stores its own state internally, and you query the DOM using a ref to find its current value when you need it. This is a bit more like traditional HTML.</li>
</ul>
<p id="f500" class="graf graf--p graf-after--li">In most (or all) cases we should use controlled components.</p>

‘setState’ function is used to update the state of a react component. If the UI of the component is dependent on the value we are updating, it will re-render the UI. For example :

setState({message : 'Hello'})

A higher-order component (HOC) is an advanced technique in React for reusing component logic. HOCs are not part of the React API. They are a pattern that emerges from React’s compositional nature.

A higher-order component is a function that takes a component and returns a new component.

HOC’s allow you to reuse code, logic and bootstrap abstraction. HOCs are common in third-party React libraries. The most common is probably Redux’s connect function. Beyond simply sharing utility libraries and simple composition, HOCs are the best way to share behavior between React Components. If you find yourself writing a lot of code in different places that does the same thing, you may be able to refactor that code into a reusable HOC.