Q121. What are the events available for server sent events?
Below are the list of events available for server sent events | Event | Description | |---- | --------- | onopen | It is used when a connection to the server is opened | ...
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Q122. How to use React label element?
If you try to render a `` element bound to a text input using the standard `for` attribute, then it produces HTML missing that attribute and prints a warning to the conso...
Q123. What are the main rules of promise?
A promise must follow a specific set of rules: 1. A promise is an object that supplies a standard-compliant `.then()` method 2. A pending promise may transition into eith...
Q124. How to combine multiple inline style objects?
You can use _spread operator_ in regular React: ```jsx harmony {"Submit"} ``` If you're using React Native then you can use the array notation: ```jsx harmony {"Submit"} ...
Q125. What is callback in callback?
You can nest one callback inside in another callback to execute the actions sequentially one by one. This is known as callbacks in callbacks. Beware, too many levels of n...
Q126. How to re-render the view when the browser is resized?
You can use the `useState` hook to manage the width and height state variables, and the `useEffect` hook to add and remove the `resize` event listener. The `[]` dependenc...
Q127. What is promise chaining?
The process of executing a sequence of asynchronous tasks one after another using promises is known as Promise chaining. Let's take an example of promise chaining for cal...
Q128. How to pretty print JSON with React?
We can use `` tag so that the formatting of the `JSON.stringify()` is retained: ```jsx harmony const data = { name: "John", age: 42 }; function User { return {JSON.string...
Q129. What is promise.all?
`Promise.all()` is a built-in JavaScript method used to handle multiple asynchronous operations together. It accepts an iterable of promises (usually an array) and return...
Q130. Why can't you update props in React?
The React philosophy is that props should be _immutable_(read only) and _top-down_. This means that a parent can send any prop values to a child, but the child can't modi...