Q831. What are membership operators?
With the operators 'in' and 'not in', we can confirm if a value is a member in another. ```python >>> 'me' in 'disappointment' ``` True ```python >>> 'us' not in 'disappo...
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Q832. What are the validity properties?
The validity property of an input element provides a set of properties related to the validity of data. 1. `customError`: It returns true, if a custom validity message is...
Q833. Explain identity operators in Python?
The operators 'is' and 'is not' tell us if two values have the same identity. ```python >>> 10 is '10' ``` False ```python >>> True is not False ``` True
Q834. Give an example usage of the rangeOverflow property
If an element's value is greater than its max attribute then the `rangeOverflow` property is true. For example, the below form submission throws an error if the value is ...
Q835. Can you dispatch multiple actions in a row with useReducer?
Yes, you can dispatch multiple actions in a row using `useReducer` but not directly in one call. You'd have to call dispatch multiple times or create a composite action i...
Q836. Are enums available in javascript?
No, javascript does not natively support enums. But there are different kinds of solutions to simulate them even though they may not provide exact equivalents. For exampl...
Q837. Is dispatch from useReducer asynchronous and does it update state immediately?
The `dispatch` function returned by `useReducer` is **not asynchronous** — it is a **synchronous** function call. When you call `dispatch(action)`, React **synchronously*...
Q838. What is an enum?
An enum is a type restricting variables to one value from a predefined set of constants. JavaScript has no enums but typescript provides built-in enum support. ```javascr...
Q839. How do you list all properties of an object?
You can use the `Object.getOwnPropertyNames()` method which returns an array of all properties found directly in a given object. Let's see the usage of this in an example...
Q840. How do you get property descriptors of an object?
You can use the `Object.getOwnPropertyDescriptors()` method which returns all own property descriptors of a given object. The example usage of this method is below, ```ja...